Merge pull request #717 from binwiederhier/twilio

Twilio
2023-05-17 11:23:09 -04:00 · 2023-05-17 11:23:09 -04:00 · b154ce5b0c
parent f998d4d2ad fc1087a42b
commit b154ce5b0c
64 changed files with 1619 additions and 300 deletions
--- a/cmd/serve.go
+++ b/cmd/serve.go
@ -71,6 +71,10 @@ var flagsServe = append(
 	altsrc.NewStringFlag(&cli.StringFlag{Name: "smtp-server-listen", Aliases: []string{"smtp_server_listen"}, EnvVars: []string{"NTFY_SMTP_SERVER_LISTEN"}, Usage: "SMTP server address (ip:port) for incoming emails, e.g. :25"}),
 	altsrc.NewStringFlag(&cli.StringFlag{Name: "smtp-server-domain", Aliases: []string{"smtp_server_domain"}, EnvVars: []string{"NTFY_SMTP_SERVER_DOMAIN"}, Usage: "SMTP domain for incoming e-mail, e.g. ntfy.sh"}),
 	altsrc.NewStringFlag(&cli.StringFlag{Name: "smtp-server-addr-prefix", Aliases: []string{"smtp_server_addr_prefix"}, EnvVars: []string{"NTFY_SMTP_SERVER_ADDR_PREFIX"}, Usage: "SMTP email address prefix for topics to prevent spam (e.g. 'ntfy-')"}),
+	altsrc.NewStringFlag(&cli.StringFlag{Name: "twilio-account", Aliases: []string{"twilio_account"}, EnvVars: []string{"NTFY_TWILIO_ACCOUNT"}, Usage: "Twilio account SID, used for phone calls, e.g. AC123..."}),
+	altsrc.NewStringFlag(&cli.StringFlag{Name: "twilio-auth-token", Aliases: []string{"twilio_auth_token"}, EnvVars: []string{"NTFY_TWILIO_AUTH_TOKEN"}, Usage: "Twilio auth token"}),
+	altsrc.NewStringFlag(&cli.StringFlag{Name: "twilio-from-number", Aliases: []string{"twilio_from_number"}, EnvVars: []string{"NTFY_TWILIO_FROM_NUMBER"}, Usage: "Twilio number to use for outgoing calls"}),
+	altsrc.NewStringFlag(&cli.StringFlag{Name: "twilio-verify-service", Aliases: []string{"twilio_verify_service"}, EnvVars: []string{"NTFY_TWILIO_VERIFY_SERVICE"}, Usage: "Twilio Verify service ID, used for phone number verification"}),
 	altsrc.NewIntFlag(&cli.IntFlag{Name: "global-topic-limit", Aliases: []string{"global_topic_limit", "T"}, EnvVars: []string{"NTFY_GLOBAL_TOPIC_LIMIT"}, Value: server.DefaultTotalTopicLimit, Usage: "total number of topics allowed"}),
 	altsrc.NewIntFlag(&cli.IntFlag{Name: "visitor-subscription-limit", Aliases: []string{"visitor_subscription_limit"}, EnvVars: []string{"NTFY_VISITOR_SUBSCRIPTION_LIMIT"}, Value: server.DefaultVisitorSubscriptionLimit, Usage: "number of subscriptions per visitor"}),
 	altsrc.NewStringFlag(&cli.StringFlag{Name: "visitor-attachment-total-size-limit", Aliases: []string{"visitor_attachment_total_size_limit"}, EnvVars: []string{"NTFY_VISITOR_ATTACHMENT_TOTAL_SIZE_LIMIT"}, Value: "100M", Usage: "total storage limit used for attachments per visitor"}),
@ -151,6 +155,10 @@ func execServe(c *cli.Context) error {
 	smtpServerListen := c.String("smtp-server-listen")
 	smtpServerDomain := c.String("smtp-server-domain")
 	smtpServerAddrPrefix := c.String("smtp-server-addr-prefix")
+	twilioAccount := c.String("twilio-account")
+	twilioAuthToken := c.String("twilio-auth-token")
+	twilioFromNumber := c.String("twilio-from-number")
+	twilioVerifyService := c.String("twilio-verify-service")
 	totalTopicLimit := c.Int("global-topic-limit")
 	visitorSubscriptionLimit := c.Int("visitor-subscription-limit")
 	visitorSubscriberRateLimiting := c.Bool("visitor-subscriber-rate-limiting")
@ -209,6 +217,8 @@ func execServe(c *cli.Context) error {
 		return errors.New("cannot set enable-signup without also setting enable-login")
 	} else if stripeSecretKey != "" && (stripeWebhookKey == "" || baseURL == "") {
 		return errors.New("if stripe-secret-key is set, stripe-webhook-key and base-url must also be set")
+	} else if twilioAccount != "" && (twilioAuthToken == "" || twilioFromNumber == "" || twilioVerifyService == "" || baseURL == "" || authFile == "") {
+		return errors.New("if twilio-account is set, twilio-auth-token, twilio-from-number, twilio-verify-service, base-url, and auth-file must also be set")
 	}

 	// Backwards compatibility
@ -308,6 +318,10 @@ func execServe(c *cli.Context) error {
 	conf.SMTPServerListen = smtpServerListen
 	conf.SMTPServerDomain = smtpServerDomain
 	conf.SMTPServerAddrPrefix = smtpServerAddrPrefix
+	conf.TwilioAccount = twilioAccount
+	conf.TwilioAuthToken = twilioAuthToken
+	conf.TwilioFromNumber = twilioFromNumber
+	conf.TwilioVerifyService = twilioVerifyService
 	conf.TotalTopicLimit = totalTopicLimit
 	conf.VisitorSubscriptionLimit = visitorSubscriptionLimit
 	conf.VisitorAttachmentTotalSizeLimit = visitorAttachmentTotalSizeLimit
--- a/cmd/tier.go
+++ b/cmd/tier.go
@ -18,6 +18,7 @@ const (
 	defaultMessageLimit             = 5000
 	defaultMessageExpiryDuration    = "12h"
 	defaultEmailLimit               = 20
+	defaultCallLimit                = 0
 	defaultReservationLimit         = 3
 	defaultAttachmentFileSizeLimit  = "15M"
 	defaultAttachmentTotalSizeLimit = "100M"
@ -48,6 +49,7 @@ var cmdTier = &cli.Command{
 				&cli.Int64Flag{Name: "message-limit", Value: defaultMessageLimit, Usage: "daily message limit"},
 				&cli.StringFlag{Name: "message-expiry-duration", Value: defaultMessageExpiryDuration, Usage: "duration after which messages are deleted"},
 				&cli.Int64Flag{Name: "email-limit", Value: defaultEmailLimit, Usage: "daily email limit"},
+				&cli.Int64Flag{Name: "call-limit", Value: defaultCallLimit, Usage: "daily phone call limit"},
 				&cli.Int64Flag{Name: "reservation-limit", Value: defaultReservationLimit, Usage: "topic reservation limit"},
 				&cli.StringFlag{Name: "attachment-file-size-limit", Value: defaultAttachmentFileSizeLimit, Usage: "per-attachment file size limit"},
 				&cli.StringFlag{Name: "attachment-total-size-limit", Value: defaultAttachmentTotalSizeLimit, Usage: "total size limit of attachments for the user"},
@ -91,6 +93,7 @@ Examples:
 				&cli.Int64Flag{Name: "message-limit", Usage: "daily message limit"},
 				&cli.StringFlag{Name: "message-expiry-duration", Usage: "duration after which messages are deleted"},
 				&cli.Int64Flag{Name: "email-limit", Usage: "daily email limit"},
+				&cli.Int64Flag{Name: "call-limit", Usage: "daily phone call limit"},
 				&cli.Int64Flag{Name: "reservation-limit", Usage: "topic reservation limit"},
 				&cli.StringFlag{Name: "attachment-file-size-limit", Usage: "per-attachment file size limit"},
 				&cli.StringFlag{Name: "attachment-total-size-limit", Usage: "total size limit of attachments for the user"},
@ -215,6 +218,7 @@ func execTierAdd(c *cli.Context) error {
 		MessageLimit:             c.Int64("message-limit"),
 		MessageExpiryDuration:    messageExpiryDuration,
 		EmailLimit:               c.Int64("email-limit"),
+		CallLimit:                c.Int64("call-limit"),
 		ReservationLimit:         c.Int64("reservation-limit"),
 		AttachmentFileSizeLimit:  attachmentFileSizeLimit,
 		AttachmentTotalSizeLimit: attachmentTotalSizeLimit,
@ -267,6 +271,9 @@ func execTierChange(c *cli.Context) error {
 	if c.IsSet("email-limit") {
 		tier.EmailLimit = c.Int64("email-limit")
 	}
+	if c.IsSet("call-limit") {
+		tier.CallLimit = c.Int64("call-limit")
+	}
 	if c.IsSet("reservation-limit") {
 		tier.ReservationLimit = c.Int64("reservation-limit")
 	}
@ -357,6 +364,7 @@ func printTier(c *cli.Context, tier *user.Tier) {
 	fmt.Fprintf(c.App.ErrWriter, "- Message limit: %d\n", tier.MessageLimit)
 	fmt.Fprintf(c.App.ErrWriter, "- Message expiry duration: %s (%d seconds)\n", tier.MessageExpiryDuration.String(), int64(tier.MessageExpiryDuration.Seconds()))
 	fmt.Fprintf(c.App.ErrWriter, "- Email limit: %d\n", tier.EmailLimit)
+	fmt.Fprintf(c.App.ErrWriter, "- Phone call limit: %d\n", tier.CallLimit)
 	fmt.Fprintf(c.App.ErrWriter, "- Reservation limit: %d\n", tier.ReservationLimit)
 	fmt.Fprintf(c.App.ErrWriter, "- Attachment file size limit: %s\n", util.FormatSize(tier.AttachmentFileSizeLimit))
 	fmt.Fprintf(c.App.ErrWriter, "- Attachment total size limit: %s\n", util.FormatSize(tier.AttachmentTotalSizeLimit))
--- a/docs/config.md
+++ b/docs/config.md
@ -814,6 +814,7 @@ ntfy tier add \
  --message-limit=10000 \
  --message-expiry-duration=24h \
  --email-limit=50 \
+  --call-limit=10 \
  --reservation-limit=10 \
  --attachment-file-size-limit=100M \
  --attachment-total-size-limit=1G \
@ -854,6 +855,22 @@ stripe-webhook-key: "whsec_ZnNkZnNIRExBSFNES0hBRFNmaHNka2ZsaGR"
 billing-contact: "phil@example.com"
 ```

+## Phone calls
+ntfy supports phone calls via [Twilio](https://www.twilio.com/) as a call provider. If phone calls are enabled,
+users can verify and add a phone number, and then receive phone calls when publishing a message using the `X-Call` header.
+See [publishing page](publish.md#phone-calls) for more details.
+
+To enable Twilio integration, sign up with [Twilio](https://www.twilio.com/), purchase a phone number (Toll free numbers
+are the easiest), and then configure the following options:
+
+* `twilio-account` is the Twilio account SID, e.g. AC12345beefbeef67890beefbeef122586
+* `twilio-auth-token` is the Twilio auth token, e.g. affebeef258625862586258625862586
+* `twilio-from-number` is the outgoing phone number you purchased, e.g. +18775132586 
+* `twilio-verify-service` is the Twilio Verify service SID, e.g. VA12345beefbeef67890beefbeef122586
+
+After you have configured phone calls, create a [tier](#tiers) with a call limit (e.g. `ntfy tier create --call-limit=10 ...`),
+and then assign it to a user. Users may then use the `X-Call` header to receive a phone call when publishing a message.
+
 ## Rate limiting
 !!! info
    Be aware that if you are running ntfy behind a proxy, you must set the `behind-proxy` flag. 
--- a/docs/publish.md
+++ b/docs/publish.md
@ -2695,6 +2695,133 @@ title `You've Got Mail` to topic `sometopic` (see [ntfy.sh/sometopic](https://nt
  <figcaption>Publishing a message via e-mail</figcaption>
 </figure>

+## Phone calls
+_Supported on:_ :material-android: :material-apple: :material-firefox:
+
+You can use ntfy to call a phone and **read the message out loud using text-to-speech**. 
+Similar to email notifications, this can be useful to blast-notify yourself on all possible channels, or to notify people that do not have 
+the ntfy app installed on their phone.
+
+**Phone numbers have to be previously verified** (via the [web app](https://ntfy.sh/account)), so this feature is 
+**only available to authenticated users** (no anonymous phone calls). To forward a message as a voice call, pass a phone
+number in the `X-Call` header (or its alias: `Call`), prefixed with a plus sign and the country code, e.g. `+12223334444`. 
+You may also simply pass `yes` as a value to pick the first of your verified phone numbers. 
+On ntfy.sh, this feature is only supported to [ntfy Pro](https://ntfy.sh/app) plans.
+
+<figure markdown>
+  ![phone number verification](static/img/web-phone-verify.png)
+  <figcaption>Phone number verification in the <a href="https://ntfy.sh/account">web app</a></figcaption>
+</figure>
+
+As of today, the text-to-speed voice used will only support English. If there is demand for other languages, we'll
+be happy to add support for that. Please [open an issue on GitHub](https://github.com/binwiederhier/ntfy/issues).
+
+!!! info
+    You are responsible for the message content, and **you must abide by the [Twilio Acceptable Use Policy](https://www.twilio.com/en-us/legal/aup)**.
+    This particularly means that you must not use this feature to send unsolicited messages, or messages that are illegal or
+    violate the rights of others. Please read the policy for details. Failure to do so may result in your account being suspended or terminated.
+
+Here's how you use it:
+
+=== "Command line (curl)"
+    ```
+    curl \
+        -u :tk_AgQdq7mVBoFD37zQVN29RhuMzNIz2 \
+        -H "Call: +12223334444" \
+        -d "Your garage seems to be on fire. You should probably check that out." \
+        ntfy.sh/alerts
+    ```
+
+=== "ntfy CLI"
+    ```
+    ntfy publish \
+        --token=tk_AgQdq7mVBoFD37zQVN29RhuMzNIz2 \
+        --call=+12223334444 \
+        alerts "Your garage seems to be on fire. You should probably check that out."
+    ```
+
+=== "HTTP"
+    ``` http
+    POST /alerts HTTP/1.1
+    Host: ntfy.sh
+    Authorization: Bearer tk_AgQdq7mVBoFD37zQVN29RhuMzNIz2
+    Call: +12223334444
+
+    Your garage seems to be on fire. You should probably check that out.
+    ```
+
+=== "JavaScript"
+    ``` javascript
+    fetch('https://ntfy.sh/alerts', {
+        method: 'POST',
+        body: "Your garage seems to be on fire. You should probably check that out.",
+        headers: { 
+            'Authorization': 'Bearer tk_AgQdq7mVBoFD37zQVN29RhuMzNIz2',
+            'Call': '+12223334444'
+        }
+    })
+    ```
+
+=== "Go"
+    ``` go
+    req, _ := http.NewRequest("POST", "https://ntfy.sh/alerts", 
+        strings.NewReader("Your garage seems to be on fire. You should probably check that out."))
+    req.Header.Set("Call", "+12223334444")
+    req.Header.Set("Authorization", "Bearer tk_AgQdq7mVBoFD37zQVN29RhuMzNIz2")
+    http.DefaultClient.Do(req)
+    ```
+
+=== "PowerShell"
+    ``` powershell
+    $Request = @{
+      Method = "POST"
+      URI = "https://ntfy.sh/alerts"
+      Headers = @{
+        Authorization = "Bearer tk_AgQdq7mVBoFD37zQVN29RhuMzNIz2"
+        Call = "+12223334444"
+      }
+      Body = "Your garage seems to be on fire. You should probably check that out."
+    }
+    Invoke-RestMethod @Request
+    ```
+
+=== "Python"
+    ``` python
+    requests.post("https://ntfy.sh/alerts",
+        data="Your garage seems to be on fire. You should probably check that out.",
+        headers={ 
+            "Authorization": "Bearer tk_AgQdq7mVBoFD37zQVN29RhuMzNIz2",
+            "Call": "+12223334444"
+        })
+    ```
+
+=== "PHP"
+    ``` php-inline
+    file_get_contents('https://ntfy.sh/alerts', false, stream_context_create([
+        'http' => [
+            'method' => 'POST',
+            'header' =>
+                "Content-Type: text/plain\r\n" .
+                "Authorization: Bearer tk_AgQdq7mVBoFD37zQVN29RhuMzNIz2\r\n" .
+                "Call: +12223334444",
+            'content' => 'Your garage seems to be on fire. You should probably check that out.'
+        ]
+    ]));
+    ```
+
+Here's what a phone call from ntfy sounds like:
+
+<audio controls>
+    <source src="../static/audio/ntfy-phone-call.mp3" type="audio/mpeg">
+    <source src="../static/audio/ntfy-phone-call.ogg" type="audio/ogg">
+</audio>
+
+Audio transcript:
+
+> You have a notification from ntfy on topic alerts.        
+> Message: Your garage seems to be on fire. You should probably check that out. End message.   
+> This message was sent by user phil. It will be repeated up to three times.
+
 ## Authentication
 Depending on whether the server is configured to support [access control](config.md#access-control), some topics
 may be read/write protected so that only users with the correct credentials can subscribe or publish to them.
@ -3314,17 +3441,18 @@ There are a few limitations to the API to prevent abuse and to keep the server h
 are configurable via the server side [rate limiting settings](config.md#rate-limiting). Most of these limits you won't run into,
 but just in case, let's list them all:

-| Limit                           | Description                                                                                                                                                                                                             |
-|---------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
-| **Message length**              | Each message can be up to 4,096 bytes long. Longer messages are treated as [attachments](#attachments).                                                                                                                 |
-| **Requests**                    | By default, the server is configured to allow 60 requests per visitor at once, and then refills the your allowed requests bucket at a rate of one request per 5 seconds.                                                |
-| **Daily messages**              | By default, the number of messages is governed by the request limits. This can be overridden. On ntfy.sh, the daily message limit is 250.                                                                               |
-| **E-mails**                     | By default, the server is configured to allow sending 16 e-mails per visitor at once, and then refills the your allowed e-mail bucket at a rate of one per hour. On ntfy.sh, the daily limit is 5.                      |
-| **Subscription limit**          | By default, the server allows each visitor to keep 30 connections to the server open.                                                                                                                                   |
-| **Attachment size limit**       | By default, the server allows attachments up to 15 MB in size, up to 100 MB in total per visitor and up to 5 GB across all visitors. On ntfy.sh, the attachment size limit is 2 MB, and the per-visitor total is 20 MB. |
-| **Attachment expiry**           | By default, the server deletes attachments after 3 hours and thereby frees up space from the total visitor attachment limit.                                                                                            |
-| **Attachment bandwidth**        | By default, the server allows 500 MB of GET/PUT/POST traffic for attachments per visitor in a 24 hour period. Traffic exceeding that is rejected. On ntfy.sh, the daily bandwidth limit is 200 MB.                      |
-| **Total number of topics**      | By default, the server is configured to allow 15,000 topics. The ntfy.sh server has higher limits though.                                                                                                               |
+| Limit                      | Description                                                                                                                                                                                                             |
+|----------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| **Message length**         | Each message can be up to 4,096 bytes long. Longer messages are treated as [attachments](#attachments).                                                                                                                 |
+| **Requests**               | By default, the server is configured to allow 60 requests per visitor at once, and then refills the your allowed requests bucket at a rate of one request per 5 seconds.                                                |
+| **Daily messages**         | By default, the number of messages is governed by the request limits. This can be overridden. On ntfy.sh, the daily message limit is 250.                                                                               |
+| **E-mails**                | By default, the server is configured to allow sending 16 e-mails per visitor at once, and then refills the your allowed e-mail bucket at a rate of one per hour. On ntfy.sh, the daily limit is 5.                      |
+| **Phone calls**            | By default, the server does not allow any phone calls, except for users with a tier that has a call limit.                                                                                                              |
+| **Subscription limit**     | By default, the server allows each visitor to keep 30 connections to the server open.                                                                                                                                   |
+| **Attachment size limit**  | By default, the server allows attachments up to 15 MB in size, up to 100 MB in total per visitor and up to 5 GB across all visitors. On ntfy.sh, the attachment size limit is 2 MB, and the per-visitor total is 20 MB. |
+| **Attachment expiry**      | By default, the server deletes attachments after 3 hours and thereby frees up space from the total visitor attachment limit.                                                                                            |
+| **Attachment bandwidth**   | By default, the server allows 500 MB of GET/PUT/POST traffic for attachments per visitor in a 24 hour period. Traffic exceeding that is rejected. On ntfy.sh, the daily bandwidth limit is 200 MB.                      |
+| **Total number of topics** | By default, the server is configured to allow 15,000 topics. The ntfy.sh server has higher limits though.                                                                                                               |

 These limits can be changed on a per-user basis using [tiers](config.md#tiers). If [payments](config.md#payments) are enabled, a user tier can be changed by purchasing
 a higher tier. ntfy.sh offers multiple paid tiers, which allows for much hier limits than the ones listed above. 
@ -3353,6 +3481,7 @@ table in their canonical form.
 | `X-Icon`        | `Icon`                                     | URL to use as notification [icon](#icons)                                                     |
 | `X-Filename`    | `Filename`, `file`, `f`                    | Optional [attachment](#attachments) filename, as it appears in the client                     |
 | `X-Email`       | `X-E-Mail`, `Email`, `E-Mail`, `mail`, `e` | E-mail address for [e-mail notifications](#e-mail-notifications)                              |
+| `X-Call`        | `Call`                                     | Phone number for [phone calls](#phone-calls)                                                  |
 | `X-Cache`       | `Cache`                                    | Allows disabling [message caching](#message-caching)                                          |
 | `X-Firebase`    | `Firebase`                                 | Allows disabling [sending to Firebase](#disable-firebase)                                     |
 | `X-UnifiedPush` | `UnifiedPush`, `up`                        | [UnifiedPush](#unifiedpush) publish option, only to be used by UnifiedPush apps               |
--- a/docs/releases.md
+++ b/docs/releases.md
@ -1182,6 +1182,7 @@ and the [ntfy Android app](https://github.com/binwiederhier/ntfy-android/release

 **Features:**

+* Support for text-to-speech style [phone calls](publish.md#phone-calls) using the `X-Call` header (no ticket)
 * Admin API to manage users and ACL, `v1/users` + `v1/users/access` ([#722](https://github.com/binwiederhier/ntfy/issues/722), thanks to [@CreativeWarlock](https://github.com/CreativeWarlock) for sponsoring this ticket)

 **Bug fixes + maintenance:**
--- a/docs/static/audio/ntfy-phone-call.mp3
+++ b/docs/static/audio/ntfy-phone-call.mp3
--- a/docs/static/audio/ntfy-phone-call.ogg
+++ b/docs/static/audio/ntfy-phone-call.ogg
--- a/docs/static/img/web-phone-verify.png
+++ b/docs/static/img/web-phone-verify.png
--- a/go.mod
+++ b/go.mod
@ -33,7 +33,7 @@ require (

 require (
 	cloud.google.com/go v0.110.2 // indirect
-	cloud.google.com/go/compute v1.19.2 // indirect
+	cloud.google.com/go/compute v1.19.3 // indirect
 	cloud.google.com/go/compute/metadata v0.2.3 // indirect
 	cloud.google.com/go/iam v1.0.1 // indirect
 	cloud.google.com/go/longrunning v0.4.2 // indirect
--- a/go.sum
+++ b/go.sum
@ -1,23 +1,15 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.110.1 h1:oDJ19Fu9TX9Xs06iyCw4yifSqZ7JQ8BeuVHcTmWQlOA=
-cloud.google.com/go v0.110.1/go.mod h1:uc+V/WjzxQ7vpkxfJhgW4Q4axWXyfAerpQOuSNDZyFw=
 cloud.google.com/go v0.110.2 h1:sdFPBr6xG9/wkBbfhmUz/JmZC7X6LavQgcrVINrKiVA=
 cloud.google.com/go v0.110.2/go.mod h1:k04UEeEtb6ZBRTv3dZz4CeJC3jKGxyhl0sAiVVquxiw=
-cloud.google.com/go/compute v1.19.1 h1:am86mquDUgjGNWxiGn+5PGLbmgiWXlE/yNWpIpNvuXY=
-cloud.google.com/go/compute v1.19.1/go.mod h1:6ylj3a05WF8leseCdIf77NK0g1ey+nj5IKd5/kvShxE=
-cloud.google.com/go/compute v1.19.2 h1:GbJtPo8OKVHbVep8jvM57KidbYHxeE68LOVqouNLrDY=
-cloud.google.com/go/compute v1.19.2/go.mod h1:5f5a+iC1IriXYauaQ0EyQmEAEq9CGRnV5xJSQSlTV08=
+cloud.google.com/go/compute v1.19.3 h1:DcTwsFgGev/wV5+q8o2fzgcHOaac+DKGC91ZlvpsQds=
+cloud.google.com/go/compute v1.19.3/go.mod h1:qxvISKp/gYnXkSAD1ppcSOveRAmzxicEv/JlizULFrI=
 cloud.google.com/go/compute/metadata v0.2.3 h1:mg4jlk7mCAj6xXp9UJ4fjI9VUI5rubuGBW5aJ7UnBMY=
 cloud.google.com/go/compute/metadata v0.2.3/go.mod h1:VAV5nSsACxMJvgaAuX6Pk2AawlZn8kiOGuCv6gTkwuA=
 cloud.google.com/go/firestore v1.9.0 h1:IBlRyxgGySXu5VuW0RgGFlTtLukSnNkpDiEOMkQkmpA=
 cloud.google.com/go/firestore v1.9.0/go.mod h1:HMkjKHNTtRyZNiMzu7YAsLr9K3X2udY2AMwDaMEQiiE=
-cloud.google.com/go/iam v1.0.0 h1:hlQJMovyJJwYjZcTohUH4o1L8Z8kYz+E+W/zktiLCBc=
-cloud.google.com/go/iam v1.0.0/go.mod h1:ikbQ4f1r91wTmBmmOtBCOtuEOei6taatNXytzB7Cxew=
 cloud.google.com/go/iam v1.0.1 h1:lyeCAU6jpnVNrE9zGQkTl3WgNgK/X+uWwaw0kynZJMU=
 cloud.google.com/go/iam v1.0.1/go.mod h1:yR3tmSL8BcZB4bxByRv2jkSIahVmCtfKZwLYGBalRE8=
-cloud.google.com/go/longrunning v0.4.1 h1:v+yFJOfKC3yZdY6ZUI933pIYdhyhV8S3NpWrXWmg7jM=
-cloud.google.com/go/longrunning v0.4.1/go.mod h1:4iWDqhBZ70CvZ6BfETbvam3T8FMvLK+eFj0E6AaRQTo=
 cloud.google.com/go/longrunning v0.4.2 h1:WDKiiNXFTaQ6qz/G8FCOkuY9kJmOJGY67wPUC1M2RbE=
 cloud.google.com/go/longrunning v0.4.2/go.mod h1:OHrnaYyLUV6oqwh0xiS7e5sLQhP1m0QU9R+WhGDMgIQ=
 cloud.google.com/go/storage v1.30.1 h1:uOdMxAs8HExqBlnLtnQyP0YkvbiDpdGShGKtx6U/oNM=
@ -147,8 +139,6 @@ github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk=
 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
-github.com/stripe/stripe-go/v74 v74.17.0 h1:qVWSzmADr6gudznuAcPjB9ewzgxfyIhBCkyTbkxJcCw=
-github.com/stripe/stripe-go/v74 v74.17.0/go.mod h1:f9L6LvaXa35ja7eyvP6GQswoaIPaBRvGAimAO+udbBw=
 github.com/stripe/stripe-go/v74 v74.18.0 h1:ImSIoaVkTUozHxa21AhwHYBjwc8fVSJJJB1Q7oaXzIw=
 github.com/stripe/stripe-go/v74 v74.18.0/go.mod h1:f9L6LvaXa35ja7eyvP6GQswoaIPaBRvGAimAO+udbBw=
 github.com/urfave/cli/v2 v2.25.3 h1:VJkt6wvEBOoSjPFQvOkv6iWIrsJyCrKGtCtxXWwmGeY=
@ -163,8 +153,6 @@ golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACk
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
 golang.org/x/crypto v0.0.0-20220314234659-1baeb1ce4c0b/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4=
-golang.org/x/crypto v0.8.0 h1:pd9TJtTueMTVQXzk8E2XESSMQDj/U7OUu0PqJqPXQjQ=
-golang.org/x/crypto v0.8.0/go.mod h1:mRqEX+O9/h5TFCrQhkgjo2yKi0yYA+9ecGkdQoHrywE=
 golang.org/x/crypto v0.9.0 h1:LF6fAI+IutBocDJ2OT0Q1g8plpYljMZ4+lty+dsqw3g=
 golang.org/x/crypto v0.9.0/go.mod h1:yrmDGqONDYtNj3tH8X9dzUun2m2lzPa9ngI6/RUPGR0=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
@ -186,14 +174,10 @@ golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v
 golang.org/x/net v0.0.0-20210520170846-37e1c6afe023/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/net v0.0.0-20211112202133-69e39bad7dc2/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
-golang.org/x/net v0.9.0 h1:aWJ/m6xSmxWBx+V0XRHTlrYrPG56jKsLdTFmsSsCzOM=
-golang.org/x/net v0.9.0/go.mod h1:d48xBJpPfHeWQsugry2m+kC02ZBRGRgulfHnEXEuWns=
 golang.org/x/net v0.10.0 h1:X2//UzNDwYmtCLn7To6G58Wr6f5ahEAQgKNzv9Y951M=
 golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
-golang.org/x/oauth2 v0.7.0 h1:qe6s0zUXlPX80/dITx3440hWZ7GwMwgDDyrSGTPJG/g=
-golang.org/x/oauth2 v0.7.0/go.mod h1:hPLQkd9LyjfXTiRohC/41GhcFqxisoUQ99sCUOHO9x4=
 golang.org/x/oauth2 v0.8.0 h1:6dkIjl3j3LtZ/O3sTgZTMsLKSftL/B8Zgq4huOIIUu8=
 golang.org/x/oauth2 v0.8.0/go.mod h1:yr7u4HXZRm1R1kBWqr/xKNqewf0plRYoB7sla+BCIXE=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@ -241,8 +225,6 @@ golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8T
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2 h1:H2TDz8ibqkAF6YGhCdN3jS9O0/s90v0rJh3X/OLHEUk=
 golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2/go.mod h1:K8+ghG5WaK9qNqU5K3HdILfMLy1f3aNYFI/wnl100a8=
-google.golang.org/api v0.121.0 h1:8Oopoo8Vavxx6gt+sgs8s8/X60WBAtKQq6JqnkF+xow=
-google.golang.org/api v0.121.0/go.mod h1:gcitW0lvnyWjSp9nKxAbdHKIZ6vF4aajGueeslZOyms=
 google.golang.org/api v0.122.0 h1:zDobeejm3E7pEG1mNHvdxvjs5XJoCMzyNH+CmwL94Es=
 google.golang.org/api v0.122.0/go.mod h1:gcitW0lvnyWjSp9nKxAbdHKIZ6vF4aajGueeslZOyms=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
--- a/log/event.go
+++ b/log/event.go
@ -41,34 +41,34 @@ func newEvent() *Event {

 // Fatal logs the event as FATAL, and exits the program with exit code 1
 func (e *Event) Fatal(message string, v ...any) {
-	e.Field(fieldExitCode, 1).maybeLog(FatalLevel, message, v...)
+	e.Field(fieldExitCode, 1).Log(FatalLevel, message, v...)
 	fmt.Fprintf(os.Stderr, message+"\n", v...) // Always output error to stderr
 	os.Exit(1)
 }

 // Error logs the event with log level error
-func (e *Event) Error(message string, v ...any) {
-	e.maybeLog(ErrorLevel, message, v...)
+func (e *Event) Error(message string, v ...any) *Event {
+	return e.Log(ErrorLevel, message, v...)
 }

 // Warn logs the event with log level warn
-func (e *Event) Warn(message string, v ...any) {
-	e.maybeLog(WarnLevel, message, v...)
+func (e *Event) Warn(message string, v ...any) *Event {
+	return e.Log(WarnLevel, message, v...)
 }

 // Info logs the event with log level info
-func (e *Event) Info(message string, v ...any) {
-	e.maybeLog(InfoLevel, message, v...)
+func (e *Event) Info(message string, v ...any) *Event {
+	return e.Log(InfoLevel, message, v...)
 }

 // Debug logs the event with log level debug
-func (e *Event) Debug(message string, v ...any) {
-	e.maybeLog(DebugLevel, message, v...)
+func (e *Event) Debug(message string, v ...any) *Event {
+	return e.Log(DebugLevel, message, v...)
 }

 // Trace logs the event with log level trace
-func (e *Event) Trace(message string, v ...any) {
-	e.maybeLog(TraceLevel, message, v...)
+func (e *Event) Trace(message string, v ...any) *Event {
+	return e.Log(TraceLevel, message, v...)
 }

 // Tag adds a "tag" field to the log event
@ -108,6 +108,14 @@ func (e *Event) Field(key string, value any) *Event {
 	return e
 }

+// FieldIf adds a custom field and value to the log event if the given level is loggable
+func (e *Event) FieldIf(key string, value any, level Level) *Event {
+	if e.Loggable(level) {
+		return e.Field(key, value)
+	}
+	return e
+}
+
 // Fields adds a map of fields to the log event
 func (e *Event) Fields(fields Context) *Event {
 	if e.fields == nil {
@ -138,7 +146,7 @@ func (e *Event) With(contexters ...Contexter) *Event {
 // to determine if they match. This is super complicated, but required for efficiency.
 func (e *Event) Render(l Level, message string, v ...any) string {
 	appliedContexters := e.maybeApplyContexters()
-	if !e.shouldLog(l) {
+	if !e.Loggable(l) {
 		return ""
 	}
 	e.Message = fmt.Sprintf(message, v...)
@ -153,11 +161,12 @@ func (e *Event) Render(l Level, message string, v ...any) string {
 	return e.String()
 }

-// maybeLog logs the event to the defined output, or does nothing if Render returns an empty string
-func (e *Event) maybeLog(l Level, message string, v ...any) {
+// Log logs the event to the defined output, or does nothing if Render returns an empty string
+func (e *Event) Log(l Level, message string, v ...any) *Event {
 	if m := e.Render(l, message, v...); m != "" {
 		log.Println(m)
 	}
+	return e
 }

 // Loggable returns true if the given log level is lower or equal to the current log level
@ -199,10 +208,6 @@ func (e *Event) String() string {
 	return fmt.Sprintf("%s %s (%s)", e.Level.String(), e.Message, strings.Join(fields, ", "))
 }

-func (e *Event) shouldLog(l Level) bool {
-	return e.globalLevelWithOverride() <= l
-}
-
 func (e *Event) globalLevelWithOverride() Level {
 	mu.RLock()
 	l, ov := level, overrides
--- a/log/log_test.go
+++ b/log/log_test.go
@ -198,6 +198,30 @@ func TestLog_LevelOverride_ManyOnSameField(t *testing.T) {
 	require.Equal(t, "", File())
 }

+func TestLog_FieldIf(t *testing.T) {
+	t.Cleanup(resetState)
+
+	var out bytes.Buffer
+	SetOutput(&out)
+	SetLevel(DebugLevel)
+	SetFormat(JSONFormat)
+
+	Time(time.Unix(11, 0).UTC()).
+		FieldIf("trace_field", "manager", TraceLevel). // This is not logged
+		Field("tag", "manager").
+		Debug("trace_field is not logged")
+	SetLevel(TraceLevel)
+	Time(time.Unix(12, 0).UTC()).
+		FieldIf("trace_field", "manager", TraceLevel). // Now it is logged
+		Field("tag", "manager").
+		Debug("trace_field is logged")
+
+	expected := `{"time":"1970-01-01T00:00:11Z","level":"DEBUG","message":"trace_field is not logged","tag":"manager"}
+{"time":"1970-01-01T00:00:12Z","level":"DEBUG","message":"trace_field is logged","tag":"manager","trace_field":"manager"}
+`
+	require.Equal(t, expected, out.String())
+}
+
 func TestLog_UsingStdLogger_JSON(t *testing.T) {
 	t.Cleanup(resetState)

--- a/server/config.go
+++ b/server/config.go
@ -105,6 +105,12 @@ type Config struct {
 	SMTPServerListen                     string
 	SMTPServerDomain                     string
 	SMTPServerAddrPrefix                 string
+	TwilioAccount                        string
+	TwilioAuthToken                      string
+	TwilioFromNumber                     string
+	TwilioCallsBaseURL                   string
+	TwilioVerifyBaseURL                  string
+	TwilioVerifyService                  string
 	MetricsEnable                        bool
 	MetricsListenHTTP                    string
 	ProfileListenHTTP                    string
@ -183,6 +189,12 @@ func NewConfig() *Config {
 		SMTPServerListen:                     "",
 		SMTPServerDomain:                     "",
 		SMTPServerAddrPrefix:                 "",
+		TwilioCallsBaseURL:                   "https://api.twilio.com", // Override for tests
+		TwilioAccount:                        "",
+		TwilioAuthToken:                      "",
+		TwilioFromNumber:                     "",
+		TwilioVerifyBaseURL:                  "https://verify.twilio.com", // Override for tests
+		TwilioVerifyService:                  "",
 		MessageLimit:                         DefaultMessageLengthLimit,
 		MinDelay:                             DefaultMinDelay,
 		MaxDelay:                             DefaultMaxDelay,
--- a/server/errors.go
+++ b/server/errors.go
@ -108,12 +108,20 @@ var (
 	errHTTPBadRequestBillingSubscriptionExists       = &errHTTP{40029, http.StatusBadRequest, "invalid request: billing subscription already exists", "", nil}
 	errHTTPBadRequestTierInvalid                     = &errHTTP{40030, http.StatusBadRequest, "invalid request: tier does not exist", "", nil}
 	errHTTPBadRequestUserNotFound                    = &errHTTP{40031, http.StatusBadRequest, "invalid request: user does not exist", "", nil}
+	errHTTPBadRequestPhoneCallsDisabled              = &errHTTP{40032, http.StatusBadRequest, "invalid request: calling is disabled", "https://ntfy.sh/docs/config/#phone-calls", nil}
+	errHTTPBadRequestPhoneNumberInvalid              = &errHTTP{40033, http.StatusBadRequest, "invalid request: phone number invalid", "https://ntfy.sh/docs/publish/#phone-calls", nil}
+	errHTTPBadRequestPhoneNumberNotVerified          = &errHTTP{40034, http.StatusBadRequest, "invalid request: phone number not verified, or no matching verified numbers found", "https://ntfy.sh/docs/publish/#phone-calls", nil}
+	errHTTPBadRequestAnonymousCallsNotAllowed        = &errHTTP{40035, http.StatusBadRequest, "invalid request: anonymous phone calls are not allowed", "https://ntfy.sh/docs/publish/#phone-calls", nil}
+	errHTTPBadRequestPhoneNumberVerifyChannelInvalid = &errHTTP{40036, http.StatusBadRequest, "invalid request: verification channel must be 'sms' or 'call'", "https://ntfy.sh/docs/publish/#phone-calls", nil}
+	errHTTPBadRequestDelayNoCall                     = &errHTTP{40037, http.StatusBadRequest, "delayed call notifications are not supported", "", nil}
 	errHTTPNotFound                                  = &errHTTP{40401, http.StatusNotFound, "page not found", "", nil}
 	errHTTPUnauthorized                              = &errHTTP{40101, http.StatusUnauthorized, "unauthorized", "https://ntfy.sh/docs/publish/#authentication", nil}
 	errHTTPForbidden                                 = &errHTTP{40301, http.StatusForbidden, "forbidden", "https://ntfy.sh/docs/publish/#authentication", nil}
 	errHTTPConflictUserExists                        = &errHTTP{40901, http.StatusConflict, "conflict: user already exists", "", nil}
 	errHTTPConflictTopicReserved                     = &errHTTP{40902, http.StatusConflict, "conflict: access control entry for topic or topic pattern already exists", "", nil}
 	errHTTPConflictSubscriptionExists                = &errHTTP{40903, http.StatusConflict, "conflict: topic subscription already exists", "", nil}
+	errHTTPConflictPhoneNumberExists                 = &errHTTP{40904, http.StatusConflict, "conflict: phone number already exists", "", nil}
+	errHTTPGonePhoneVerificationExpired              = &errHTTP{41001, http.StatusGone, "phone number verification expired or does not exist", "", nil}
 	errHTTPEntityTooLargeAttachment                  = &errHTTP{41301, http.StatusRequestEntityTooLarge, "attachment too large, or bandwidth limit reached", "https://ntfy.sh/docs/publish/#limitations", nil}
 	errHTTPEntityTooLargeMatrixRequest               = &errHTTP{41302, http.StatusRequestEntityTooLarge, "Matrix request is larger than the max allowed length", "", nil}
 	errHTTPEntityTooLargeJSONBody                    = &errHTTP{41303, http.StatusRequestEntityTooLarge, "JSON body too large", "", nil}
@ -126,6 +134,7 @@ var (
 	errHTTPTooManyRequestsLimitReservations          = &errHTTP{42907, http.StatusTooManyRequests, "limit reached: too many topic reservations for this user", "", nil}
 	errHTTPTooManyRequestsLimitMessages              = &errHTTP{42908, http.StatusTooManyRequests, "limit reached: daily message quota reached", "https://ntfy.sh/docs/publish/#limitations", nil}
 	errHTTPTooManyRequestsLimitAuthFailure           = &errHTTP{42909, http.StatusTooManyRequests, "limit reached: too many auth failures", "https://ntfy.sh/docs/publish/#limitations", nil} // FIXME document limit
+	errHTTPTooManyRequestsLimitCalls                 = &errHTTP{42910, http.StatusTooManyRequests, "limit reached: daily phone call quota reached", "https://ntfy.sh/docs/publish/#limitations", nil}
 	errHTTPInternalError                             = &errHTTP{50001, http.StatusInternalServerError, "internal server error", "", nil}
 	errHTTPInternalErrorInvalidPath                  = &errHTTP{50002, http.StatusInternalServerError, "internal server error: invalid path", "", nil}
 	errHTTPInternalErrorMissingBaseURL               = &errHTTP{50003, http.StatusInternalServerError, "internal server error: base-url must be be configured for this feature", "https://ntfy.sh/docs/config/", nil}
--- a/server/log.go
+++ b/server/log.go
@ -20,6 +20,7 @@ const (
 	tagFirebase     = "firebase"
 	tagSMTP         = "smtp"  // Receive email
 	tagEmail        = "email" // Send email
+	tagTwilio       = "twilio"
 	tagFileCache    = "file_cache"
 	tagMessageCache = "message_cache"
 	tagStripe       = "stripe"
--- a/server/server.go
+++ b/server/server.go
@ -90,6 +90,8 @@ var (
 	apiAccountSettingsPath                               = "/v1/account/settings"
 	apiAccountSubscriptionPath                           = "/v1/account/subscription"
 	apiAccountReservationPath                            = "/v1/account/reservation"
+	apiAccountPhonePath                                  = "/v1/account/phone"
+	apiAccountPhoneVerifyPath                            = "/v1/account/phone/verify"
 	apiAccountBillingPortalPath                          = "/v1/account/billing/portal"
 	apiAccountBillingWebhookPath                         = "/v1/account/billing/webhook"
 	apiAccountBillingSubscriptionPath                    = "/v1/account/billing/subscription"
@ -100,6 +102,7 @@ var (
 	docsRegex                                            = regexp.MustCompile(`^/docs(|/.*)$`)
 	fileRegex                                            = regexp.MustCompile(`^/file/([-_A-Za-z0-9]{1,64})(?:\.[A-Za-z0-9]{1,16})?$`)
 	urlRegex                                             = regexp.MustCompile(`^https?://`)
+	phoneNumberRegex                                     = regexp.MustCompile(`^\+\d{1,100}$`)

 	//go:embed site
 	webFs       embed.FS
@ -461,6 +464,12 @@ func (s *Server) handleInternal(w http.ResponseWriter, r *http.Request, v *visit
 		return s.ensurePaymentsEnabled(s.ensureStripeCustomer(s.handleAccountBillingPortalSessionCreate))(w, r, v)
 	} else if r.Method == http.MethodPost && r.URL.Path == apiAccountBillingWebhookPath {
 		return s.ensurePaymentsEnabled(s.ensureUserManager(s.handleAccountBillingWebhook))(w, r, v) // This request comes from Stripe!
+	} else if r.Method == http.MethodPut && r.URL.Path == apiAccountPhoneVerifyPath {
+		return s.ensureUser(s.ensureCallsEnabled(s.withAccountSync(s.handleAccountPhoneNumberVerify)))(w, r, v)
+	} else if r.Method == http.MethodPut && r.URL.Path == apiAccountPhonePath {
+		return s.ensureUser(s.ensureCallsEnabled(s.withAccountSync(s.handleAccountPhoneNumberAdd)))(w, r, v)
+	} else if r.Method == http.MethodDelete && r.URL.Path == apiAccountPhonePath {
+		return s.ensureUser(s.ensureCallsEnabled(s.withAccountSync(s.handleAccountPhoneNumberDelete)))(w, r, v)
 	} else if r.Method == http.MethodGet && r.URL.Path == apiStatsPath {
 		return s.handleStats(w, r, v)
 	} else if r.Method == http.MethodGet && r.URL.Path == apiTiersPath {
@ -540,6 +549,8 @@ func (s *Server) handleWebConfig(w http.ResponseWriter, _ *http.Request, _ *visi
 		EnableLogin:        s.config.EnableLogin,
 		EnableSignup:       s.config.EnableSignup,
 		EnablePayments:     s.config.StripeSecretKey != "",
+		EnableCalls:        s.config.TwilioAccount != "",
+		EnableEmails:       s.config.SMTPSenderFrom != "",
 		EnableReservations: s.config.EnableReservations,
 		BillingContact:     s.config.BillingContact,
 		DisallowedTopics:   s.config.DisallowedTopics,
@ -683,7 +694,7 @@ func (s *Server) handlePublishInternal(r *http.Request, v *visitor) (*message, e
 		return nil, err
 	}
 	m := newDefaultMessage(t.ID, "")
-	cache, firebase, email, unifiedpush, e := s.parsePublishParams(r, m)
+	cache, firebase, email, call, unifiedpush, e := s.parsePublishParams(r, m)
 	if e != nil {
 		return nil, e.With(t)
 	}
@ -697,6 +708,14 @@ func (s *Server) handlePublishInternal(r *http.Request, v *visitor) (*message, e
 		return nil, errHTTPTooManyRequestsLimitMessages.With(t)
 	} else if email != "" && !vrate.EmailAllowed() {
 		return nil, errHTTPTooManyRequestsLimitEmails.With(t)
+	} else if call != "" {
+		var httpErr *errHTTP
+		call, httpErr = s.convertPhoneNumber(v.User(), call)
+		if httpErr != nil {
+			return nil, httpErr.With(t)
+		} else if !vrate.CallAllowed() {
+			return nil, errHTTPTooManyRequestsLimitCalls.With(t)
+		}
 	}
 	if m.PollID != "" {
 		m = newPollRequestMessage(t.ID, m.PollID)
@ -721,6 +740,7 @@ func (s *Server) handlePublishInternal(r *http.Request, v *visitor) (*message, e
 			"message_firebase":    firebase,
 			"message_unifiedpush": unifiedpush,
 			"message_email":       email,
+			"message_call":        call,
 		})
 	if ev.IsTrace() {
 		ev.Field("message_body", util.MaybeMarshalJSON(m)).Trace("Received message")
@ -737,6 +757,9 @@ func (s *Server) handlePublishInternal(r *http.Request, v *visitor) (*message, e
 		if s.smtpSender != nil && email != "" {
 			go s.sendEmail(v, m, email)
 		}
+		if s.config.TwilioAccount != "" && call != "" {
+			go s.callPhone(v, r, m, call)
+		}
 		if s.config.UpstreamBaseURL != "" {
 			go s.forwardPollRequest(v, m)
 		}
@ -846,7 +869,7 @@ func (s *Server) forwardPollRequest(v *visitor, m *message) {
 	}
 }

-func (s *Server) parsePublishParams(r *http.Request, m *message) (cache bool, firebase bool, email string, unifiedpush bool, err *errHTTP) {
+func (s *Server) parsePublishParams(r *http.Request, m *message) (cache bool, firebase bool, email, call string, unifiedpush bool, err *errHTTP) {
 	cache = readBoolParam(r, true, "x-cache", "cache")
 	firebase = readBoolParam(r, true, "x-firebase", "firebase")
 	m.Title = maybeDecodeHeader(readParam(r, "x-title", "title", "t"))
@ -862,7 +885,7 @@ func (s *Server) parsePublishParams(r *http.Request, m *message) (cache bool, fi
 	}
 	if attach != "" {
 		if !urlRegex.MatchString(attach) {
-			return false, false, "", false, errHTTPBadRequestAttachmentURLInvalid
+			return false, false, "", "", false, errHTTPBadRequestAttachmentURLInvalid
 		}
 		m.Attachment.URL = attach
 		if m.Attachment.Name == "" {
@ -880,13 +903,19 @@ func (s *Server) parsePublishParams(r *http.Request, m *message) (cache bool, fi
 	}
 	if icon != "" {
 		if !urlRegex.MatchString(icon) {
-			return false, false, "", false, errHTTPBadRequestIconURLInvalid
+			return false, false, "", "", false, errHTTPBadRequestIconURLInvalid
 		}
 		m.Icon = icon
 	}
 	email = readParam(r, "x-email", "x-e-mail", "email", "e-mail", "mail", "e")
 	if s.smtpSender == nil && email != "" {
-		return false, false, "", false, errHTTPBadRequestEmailDisabled
+		return false, false, "", "", false, errHTTPBadRequestEmailDisabled
+	}
+	call = readParam(r, "x-call", "call")
+	if call != "" && (s.config.TwilioAccount == "" || s.userManager == nil) {
+		return false, false, "", "", false, errHTTPBadRequestPhoneCallsDisabled
+	} else if call != "" && !isBoolValue(call) && !phoneNumberRegex.MatchString(call) {
+		return false, false, "", "", false, errHTTPBadRequestPhoneNumberInvalid
 	}
 	messageStr := strings.ReplaceAll(readParam(r, "x-message", "message", "m"), "\\n", "\n")
 	if messageStr != "" {
@ -895,7 +924,7 @@ func (s *Server) parsePublishParams(r *http.Request, m *message) (cache bool, fi
 	var e error
 	m.Priority, e = util.ParsePriority(readParam(r, "x-priority", "priority", "prio", "p"))
 	if e != nil {
-		return false, false, "", false, errHTTPBadRequestPriorityInvalid
+		return false, false, "", "", false, errHTTPBadRequestPriorityInvalid
 	}
 	m.Tags = readCommaSeparatedParam(r, "x-tags", "tags", "tag", "ta")
 	for i, t := range m.Tags {
@ -904,18 +933,21 @@ func (s *Server) parsePublishParams(r *http.Request, m *message) (cache bool, fi
 	delayStr := readParam(r, "x-delay", "delay", "x-at", "at", "x-in", "in")
 	if delayStr != "" {
 		if !cache {
-			return false, false, "", false, errHTTPBadRequestDelayNoCache
+			return false, false, "", "", false, errHTTPBadRequestDelayNoCache
 		}
 		if email != "" {
-			return false, false, "", false, errHTTPBadRequestDelayNoEmail // we cannot store the email address (yet)
+			return false, false, "", "", false, errHTTPBadRequestDelayNoEmail // we cannot store the email address (yet)
+		}
+		if call != "" {
+			return false, false, "", "", false, errHTTPBadRequestDelayNoCall // we cannot store the phone number (yet)
 		}
 		delay, err := util.ParseFutureTime(delayStr, time.Now())
 		if err != nil {
-			return false, false, "", false, errHTTPBadRequestDelayCannotParse
+			return false, false, "", "", false, errHTTPBadRequestDelayCannotParse
 		} else if delay.Unix() < time.Now().Add(s.config.MinDelay).Unix() {
-			return false, false, "", false, errHTTPBadRequestDelayTooSmall
+			return false, false, "", "", false, errHTTPBadRequestDelayTooSmall
 		} else if delay.Unix() > time.Now().Add(s.config.MaxDelay).Unix() {
-			return false, false, "", false, errHTTPBadRequestDelayTooLarge
+			return false, false, "", "", false, errHTTPBadRequestDelayTooLarge
 		}
 		m.Time = delay.Unix()
 	}
@ -923,7 +955,7 @@ func (s *Server) parsePublishParams(r *http.Request, m *message) (cache bool, fi
 	if actionsStr != "" {
 		m.Actions, e = parseActions(actionsStr)
 		if e != nil {
-			return false, false, "", false, errHTTPBadRequestActionsInvalid.Wrap(e.Error())
+			return false, false, "", "", false, errHTTPBadRequestActionsInvalid.Wrap(e.Error())
 		}
 	}
 	unifiedpush = readBoolParam(r, false, "x-unifiedpush", "unifiedpush", "up") // see GET too!
@ -937,7 +969,7 @@ func (s *Server) parsePublishParams(r *http.Request, m *message) (cache bool, fi
 		cache = false
 		email = ""
 	}
-	return cache, firebase, email, unifiedpush, nil
+	return cache, firebase, email, call, unifiedpush, nil
 }

 // handlePublishBody consumes the PUT/POST body and decides whether the body is an attachment or the message.
--- a/server/server.yml
+++ b/server/server.yml
@ -144,6 +144,18 @@
 # smtp-server-domain:
 # smtp-server-addr-prefix:

+# If enabled, ntfy can perform voice calls via Twilio via the "X-Call" header.
+#
+# - twilio-account is the Twilio account SID, e.g. AC12345beefbeef67890beefbeef122586
+# - twilio-auth-token is the Twilio auth token, e.g. affebeef258625862586258625862586
+# - twilio-from-number is the outgoing phone number you purchased, e.g. +18775132586
+# - twilio-verify-service is the Twilio Verify service SID, e.g. VA12345beefbeef67890beefbeef122586
+#
+# twilio-account:
+# twilio-auth-token:
+# twilio-from-number:
+# twilio-verify-service:
+
 # Interval in which keepalive messages are sent to the client. This is to prevent
 # intermediaries closing the connection for inactivity.
 #
--- a/server/server_account.go
+++ b/server/server_account.go
@ -56,6 +56,7 @@ func (s *Server) handleAccountGet(w http.ResponseWriter, r *http.Request, v *vis
 			Messages:                 limits.MessageLimit,
 			MessagesExpiryDuration:   int64(limits.MessageExpiryDuration.Seconds()),
 			Emails:                   limits.EmailLimit,
+			Calls:                    limits.CallLimit,
 			Reservations:             limits.ReservationsLimit,
 			AttachmentTotalSize:      limits.AttachmentTotalSizeLimit,
 			AttachmentFileSize:       limits.AttachmentFileSizeLimit,
@ -67,6 +68,8 @@ func (s *Server) handleAccountGet(w http.ResponseWriter, r *http.Request, v *vis
 			MessagesRemaining:            stats.MessagesRemaining,
 			Emails:                       stats.Emails,
 			EmailsRemaining:              stats.EmailsRemaining,
+			Calls:                        stats.Calls,
+			CallsRemaining:               stats.CallsRemaining,
 			Reservations:                 stats.Reservations,
 			ReservationsRemaining:        stats.ReservationsRemaining,
 			AttachmentTotalSize:          stats.AttachmentTotalSize,
@ -105,17 +108,19 @@ func (s *Server) handleAccountGet(w http.ResponseWriter, r *http.Request, v *vis
 				CancelAt:     u.Billing.StripeSubscriptionCancelAt.Unix(),
 			}
 		}
-		reservations, err := s.userManager.Reservations(u.Name)
-		if err != nil {
-			return err
-		}
-		if len(reservations) > 0 {
-			response.Reservations = make([]*apiAccountReservation, 0)
-			for _, r := range reservations {
-				response.Reservations = append(response.Reservations, &apiAccountReservation{
-					Topic:    r.Topic,
-					Everyone: r.Everyone.String(),
-				})
+		if s.config.EnableReservations {
+			reservations, err := s.userManager.Reservations(u.Name)
+			if err != nil {
+				return err
+			}
+			if len(reservations) > 0 {
+				response.Reservations = make([]*apiAccountReservation, 0)
+				for _, r := range reservations {
+					response.Reservations = append(response.Reservations, &apiAccountReservation{
+						Topic:    r.Topic,
+						Everyone: r.Everyone.String(),
+					})
+				}
 			}
 		}
 		tokens, err := s.userManager.Tokens(u.ID)
@ -138,6 +143,15 @@ func (s *Server) handleAccountGet(w http.ResponseWriter, r *http.Request, v *vis
 				})
 			}
 		}
+		if s.config.TwilioAccount != "" {
+			phoneNumbers, err := s.userManager.PhoneNumbers(u.ID)
+			if err != nil {
+				return err
+			}
+			if len(phoneNumbers) > 0 {
+				response.PhoneNumbers = phoneNumbers
+			}
+		}
 	} else {
 		response.Username = user.Everyone
 		response.Role = string(user.RoleAnonymous)
@ -511,6 +525,72 @@ func (s *Server) maybeRemoveMessagesAndExcessReservations(r *http.Request, v *vi
 	return nil
 }

+func (s *Server) handleAccountPhoneNumberVerify(w http.ResponseWriter, r *http.Request, v *visitor) error {
+	u := v.User()
+	req, err := readJSONWithLimit[apiAccountPhoneNumberVerifyRequest](r.Body, jsonBodyBytesLimit, false)
+	if err != nil {
+		return err
+	} else if !phoneNumberRegex.MatchString(req.Number) {
+		return errHTTPBadRequestPhoneNumberInvalid
+	} else if req.Channel != "sms" && req.Channel != "call" {
+		return errHTTPBadRequestPhoneNumberVerifyChannelInvalid
+	}
+	// Check user is allowed to add phone numbers
+	if u == nil || (u.IsUser() && u.Tier == nil) {
+		return errHTTPUnauthorized
+	} else if u.IsUser() && u.Tier.CallLimit == 0 {
+		return errHTTPUnauthorized
+	}
+	// Check if phone number exists
+	phoneNumbers, err := s.userManager.PhoneNumbers(u.ID)
+	if err != nil {
+		return err
+	} else if util.Contains(phoneNumbers, req.Number) {
+		return errHTTPConflictPhoneNumberExists
+	}
+	// Actually add the unverified number, and send verification
+	logvr(v, r).Tag(tagAccount).Field("phone_number", req.Number).Debug("Sending phone number verification")
+	if err := s.verifyPhoneNumber(v, r, req.Number, req.Channel); err != nil {
+		return err
+	}
+	return s.writeJSON(w, newSuccessResponse())
+}
+
+func (s *Server) handleAccountPhoneNumberAdd(w http.ResponseWriter, r *http.Request, v *visitor) error {
+	u := v.User()
+	req, err := readJSONWithLimit[apiAccountPhoneNumberAddRequest](r.Body, jsonBodyBytesLimit, false)
+	if err != nil {
+		return err
+	}
+	if !phoneNumberRegex.MatchString(req.Number) {
+		return errHTTPBadRequestPhoneNumberInvalid
+	}
+	if err := s.verifyPhoneNumberCheck(v, r, req.Number, req.Code); err != nil {
+		return err
+	}
+	logvr(v, r).Tag(tagAccount).Field("phone_number", req.Number).Debug("Adding phone number as verified")
+	if err := s.userManager.AddPhoneNumber(u.ID, req.Number); err != nil {
+		return err
+	}
+	return s.writeJSON(w, newSuccessResponse())
+}
+
+func (s *Server) handleAccountPhoneNumberDelete(w http.ResponseWriter, r *http.Request, v *visitor) error {
+	u := v.User()
+	req, err := readJSONWithLimit[apiAccountPhoneNumberAddRequest](r.Body, jsonBodyBytesLimit, false)
+	if err != nil {
+		return err
+	}
+	if !phoneNumberRegex.MatchString(req.Number) {
+		return errHTTPBadRequestPhoneNumberInvalid
+	}
+	logvr(v, r).Tag(tagAccount).Field("phone_number", req.Number).Debug("Deleting phone number")
+	if err := s.userManager.RemovePhoneNumber(u.ID, req.Number); err != nil {
+		return err
+	}
+	return s.writeJSON(w, newSuccessResponse())
+}
+
 // publishSyncEventAsync kicks of a Go routine to publish a sync message to the user's sync topic
 func (s *Server) publishSyncEventAsync(v *visitor) {
 	go func() {
--- a/server/server_account_test.go
+++ b/server/server_account_test.go
@ -151,6 +151,8 @@ func TestAccount_Get_Anonymous(t *testing.T) {
 	require.Equal(t, int64(1004), account.Stats.MessagesRemaining)
 	require.Equal(t, int64(0), account.Stats.Emails)
 	require.Equal(t, int64(24), account.Stats.EmailsRemaining)
+	require.Equal(t, int64(0), account.Stats.Calls)
+	require.Equal(t, int64(0), account.Stats.CallsRemaining)

 	rr = request(t, s, "POST", "/mytopic", "", nil)
 	require.Equal(t, 200, rr.Code)
@ -498,6 +500,8 @@ func TestAccount_Reservation_AddAdminSuccess(t *testing.T) {
 func TestAccount_Reservation_AddRemoveUserWithTierSuccess(t *testing.T) {
 	conf := newTestConfigWithAuthFile(t)
 	conf.EnableSignup = true
+	conf.EnableReservations = true
+	conf.TwilioAccount = "dummy"
 	s := newTestServer(t, conf)

 	// Create user
@ -510,6 +514,7 @@ func TestAccount_Reservation_AddRemoveUserWithTierSuccess(t *testing.T) {
 		MessageLimit:             123,
 		MessageExpiryDuration:    86400 * time.Second,
 		EmailLimit:               32,
+		CallLimit:                10,
 		ReservationLimit:         2,
 		AttachmentFileSizeLimit:  1231231,
 		AttachmentTotalSizeLimit: 123123,
@ -551,6 +556,7 @@ func TestAccount_Reservation_AddRemoveUserWithTierSuccess(t *testing.T) {
 	require.Equal(t, int64(123), account.Limits.Messages)
 	require.Equal(t, int64(86400), account.Limits.MessagesExpiryDuration)
 	require.Equal(t, int64(32), account.Limits.Emails)
+	require.Equal(t, int64(10), account.Limits.Calls)
 	require.Equal(t, int64(2), account.Limits.Reservations)
 	require.Equal(t, int64(1231231), account.Limits.AttachmentFileSize)
 	require.Equal(t, int64(123123), account.Limits.AttachmentTotalSize)
--- a/server/server_metrics.go
+++ b/server/server_metrics.go
@ -15,6 +15,8 @@ var (
 	metricEmailsPublishedFailure       prometheus.Counter
 	metricEmailsReceivedSuccess        prometheus.Counter
 	metricEmailsReceivedFailure        prometheus.Counter
+	metricCallsMadeSuccess             prometheus.Counter
+	metricCallsMadeFailure             prometheus.Counter
 	metricUnifiedPushPublishedSuccess  prometheus.Counter
 	metricMatrixPublishedSuccess       prometheus.Counter
 	metricMatrixPublishedFailure       prometheus.Counter
@ -57,6 +59,12 @@ func initMetrics() {
 	metricEmailsReceivedFailure = prometheus.NewCounter(prometheus.CounterOpts{
 		Name: "ntfy_emails_received_failure",
 	})
+	metricCallsMadeSuccess = prometheus.NewCounter(prometheus.CounterOpts{
+		Name: "ntfy_calls_made_success",
+	})
+	metricCallsMadeFailure = prometheus.NewCounter(prometheus.CounterOpts{
+		Name: "ntfy_calls_made_failure",
+	})
 	metricUnifiedPushPublishedSuccess = prometheus.NewCounter(prometheus.CounterOpts{
 		Name: "ntfy_unifiedpush_published_success",
 	})
@ -95,6 +103,8 @@ func initMetrics() {
 		metricEmailsPublishedFailure,
 		metricEmailsReceivedSuccess,
 		metricEmailsReceivedFailure,
+		metricCallsMadeSuccess,
+		metricCallsMadeFailure,
 		metricUnifiedPushPublishedSuccess,
 		metricMatrixPublishedSuccess,
 		metricMatrixPublishedFailure,
--- a/server/server_middleware.go
+++ b/server/server_middleware.go
@ -85,6 +85,15 @@ func (s *Server) ensureAdmin(next handleFunc) handleFunc {
 	})
 }

+func (s *Server) ensureCallsEnabled(next handleFunc) handleFunc {
+	return func(w http.ResponseWriter, r *http.Request, v *visitor) error {
+		if s.config.TwilioAccount == "" || s.userManager == nil {
+			return errHTTPNotFound
+		}
+		return next(w, r, v)
+	}
+}
+
 func (s *Server) ensurePaymentsEnabled(next handleFunc) handleFunc {
 	return func(w http.ResponseWriter, r *http.Request, v *visitor) error {
 		if s.config.StripeSecretKey == "" || s.stripe == nil {
--- a/server/server_payments.go
+++ b/server/server_payments.go
@ -68,6 +68,7 @@ func (s *Server) handleBillingTiersGet(w http.ResponseWriter, _ *http.Request, _
 				Messages:                 freeTier.MessageLimit,
 				MessagesExpiryDuration:   int64(freeTier.MessageExpiryDuration.Seconds()),
 				Emails:                   freeTier.EmailLimit,
+				Calls:                    freeTier.CallLimit,
 				Reservations:             freeTier.ReservationsLimit,
 				AttachmentTotalSize:      freeTier.AttachmentTotalSizeLimit,
 				AttachmentFileSize:       freeTier.AttachmentFileSizeLimit,
@ -96,6 +97,7 @@ func (s *Server) handleBillingTiersGet(w http.ResponseWriter, _ *http.Request, _
 				Messages:                 tier.MessageLimit,
 				MessagesExpiryDuration:   int64(tier.MessageExpiryDuration.Seconds()),
 				Emails:                   tier.EmailLimit,
+				Calls:                    tier.CallLimit,
 				Reservations:             tier.ReservationLimit,
 				AttachmentTotalSize:      tier.AttachmentTotalSizeLimit,
 				AttachmentFileSize:       tier.AttachmentFileSizeLimit,
--- a/server/server_test.go
+++ b/server/server_test.go
@ -1190,7 +1190,20 @@ func TestServer_PublishDelayedEmail_Fail(t *testing.T) {
 		"E-Mail": "test@example.com",
 		"Delay":  "20 min",
 	})
-	require.Equal(t, 400, response.Code)
+	require.Equal(t, 40003, toHTTPError(t, response.Body.String()).Code)
+}
+
+func TestServer_PublishDelayedCall_Fail(t *testing.T) {
+	c := newTestConfigWithAuthFile(t)
+	c.TwilioAccount = "AC1234567890"
+	c.TwilioAuthToken = "AAEAA1234567890"
+	c.TwilioFromNumber = "+1234567890"
+	s := newTestServer(t, c)
+	response := request(t, s, "PUT", "/mytopic", "fail", map[string]string{
+		"Call":  "yes",
+		"Delay": "20 min",
+	})
+	require.Equal(t, 40037, toHTTPError(t, response.Body.String()).Code)
 }

 func TestServer_PublishEmailNoMailer_Fail(t *testing.T) {
--- a/server/server_twilio.go
+++ b/server/server_twilio.go
@ -0,0 +1,173 @@
+package server
+
+import (
+	"bytes"
+	"encoding/xml"
+	"fmt"
+	"heckel.io/ntfy/log"
+	"heckel.io/ntfy/user"
+	"heckel.io/ntfy/util"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+)
+
+const (
+	twilioCallFormat = `
+<Response>
+	<Pause length="1"/>
+	<Say loop="3">
+		You have a message from notify on topic %s. Message:
+		<break time="1s"/>
+		%s
+		<break time="1s"/>
+		End of message.
+		<break time="1s"/>
+		This message was sent by user %s. It will be repeated three times.
+		To unsubscribe from calls like this, remove your phone number in the notify web app.
+		<break time="3s"/>
+	</Say>
+	<Say>Goodbye.</Say>
+</Response>`
+)
+
+// convertPhoneNumber checks if the given phone number is verified for the given user, and if so, returns the verified
+// phone number. It also converts a boolean string ("yes", "1", "true") to the first verified phone number.
+// If the user is anonymous, it will return an error.
+func (s *Server) convertPhoneNumber(u *user.User, phoneNumber string) (string, *errHTTP) {
+	if u == nil {
+		return "", errHTTPBadRequestAnonymousCallsNotAllowed
+	}
+	phoneNumbers, err := s.userManager.PhoneNumbers(u.ID)
+	if err != nil {
+		return "", errHTTPInternalError
+	} else if len(phoneNumbers) == 0 {
+		return "", errHTTPBadRequestPhoneNumberNotVerified
+	}
+	if toBool(phoneNumber) {
+		return phoneNumbers[0], nil
+	} else if util.Contains(phoneNumbers, phoneNumber) {
+		return phoneNumber, nil
+	}
+	for _, p := range phoneNumbers {
+		if p == phoneNumber {
+			return phoneNumber, nil
+		}
+	}
+	return "", errHTTPBadRequestPhoneNumberNotVerified
+}
+
+// callPhone calls the Twilio API to make a phone call to the given phone number, using the given message.
+// Failures will be logged, but not returned to the caller.
+func (s *Server) callPhone(v *visitor, r *http.Request, m *message, to string) {
+	u, sender := v.User(), m.Sender.String()
+	if u != nil {
+		sender = u.Name
+	}
+	body := fmt.Sprintf(twilioCallFormat, xmlEscapeText(m.Topic), xmlEscapeText(m.Message), xmlEscapeText(sender))
+	data := url.Values{}
+	data.Set("From", s.config.TwilioFromNumber)
+	data.Set("To", to)
+	data.Set("Twiml", body)
+	ev := logvrm(v, r, m).Tag(tagTwilio).Field("twilio_to", to).FieldIf("twilio_body", body, log.TraceLevel).Debug("Sending Twilio request")
+	response, err := s.callPhoneInternal(data)
+	if err != nil {
+		ev.Field("twilio_response", response).Err(err).Warn("Error sending Twilio request")
+		minc(metricCallsMadeFailure)
+		return
+	}
+	ev.FieldIf("twilio_response", response, log.TraceLevel).Debug("Received successful Twilio response")
+	minc(metricCallsMadeSuccess)
+}
+
+func (s *Server) callPhoneInternal(data url.Values) (string, error) {
+	requestURL := fmt.Sprintf("%s/2010-04-01/Accounts/%s/Calls.json", s.config.TwilioCallsBaseURL, s.config.TwilioAccount)
+	req, err := http.NewRequest(http.MethodPost, requestURL, strings.NewReader(data.Encode()))
+	if err != nil {
+		return "", err
+	}
+	req.Header.Set("Authorization", util.BasicAuth(s.config.TwilioAccount, s.config.TwilioAuthToken))
+	req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return "", err
+	}
+	response, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", err
+	}
+	return string(response), nil
+}
+
+func (s *Server) verifyPhoneNumber(v *visitor, r *http.Request, phoneNumber, channel string) error {
+	ev := logvr(v, r).Tag(tagTwilio).Field("twilio_to", phoneNumber).Field("twilio_channel", channel).Debug("Sending phone verification")
+	data := url.Values{}
+	data.Set("To", phoneNumber)
+	data.Set("Channel", channel)
+	requestURL := fmt.Sprintf("%s/v2/Services/%s/Verifications", s.config.TwilioVerifyBaseURL, s.config.TwilioVerifyService)
+	req, err := http.NewRequest(http.MethodPost, requestURL, strings.NewReader(data.Encode()))
+	if err != nil {
+		return err
+	}
+	req.Header.Set("Authorization", util.BasicAuth(s.config.TwilioAccount, s.config.TwilioAuthToken))
+	req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return err
+	}
+	response, err := io.ReadAll(resp.Body)
+	if err != nil {
+		ev.Err(err).Warn("Error sending Twilio phone verification request")
+		return err
+	}
+	ev.FieldIf("twilio_response", string(response), log.TraceLevel).Debug("Received Twilio phone verification response")
+	return nil
+}
+
+func (s *Server) verifyPhoneNumberCheck(v *visitor, r *http.Request, phoneNumber, code string) error {
+	ev := logvr(v, r).Tag(tagTwilio).Field("twilio_to", phoneNumber).Debug("Checking phone verification")
+	data := url.Values{}
+	data.Set("To", phoneNumber)
+	data.Set("Code", code)
+	requestURL := fmt.Sprintf("%s/v2/Services/%s/VerificationCheck", s.config.TwilioVerifyBaseURL, s.config.TwilioVerifyService)
+	req, err := http.NewRequest(http.MethodPost, requestURL, strings.NewReader(data.Encode()))
+	if err != nil {
+		return err
+	}
+	req.Header.Set("Authorization", util.BasicAuth(s.config.TwilioAccount, s.config.TwilioAuthToken))
+	req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return err
+	} else if resp.StatusCode != http.StatusOK {
+		if ev.IsTrace() {
+			response, err := io.ReadAll(resp.Body)
+			if err != nil {
+				return err
+			}
+			ev.Field("twilio_response", string(response))
+		}
+		ev.Warn("Twilio phone verification failed with status code %d", resp.StatusCode)
+		if resp.StatusCode == http.StatusNotFound {
+			return errHTTPGonePhoneVerificationExpired
+		}
+		return errHTTPInternalError
+	}
+	response, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return err
+	}
+	if ev.IsTrace() {
+		ev.Field("twilio_response", string(response)).Trace("Received successful Twilio phone verification response")
+	} else if ev.IsDebug() {
+		ev.Debug("Received successful Twilio phone verification response")
+	}
+	return nil
+}
+
+func xmlEscapeText(text string) string {
+	var buf bytes.Buffer
+	_ = xml.EscapeText(&buf, []byte(text))
+	return buf.String()
+}
--- a/server/server_twilio_test.go
+++ b/server/server_twilio_test.go
@ -0,0 +1,264 @@
+package server
+
+import (
+	"github.com/stretchr/testify/require"
+	"heckel.io/ntfy/user"
+	"heckel.io/ntfy/util"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"sync/atomic"
+	"testing"
+)
+
+func TestServer_Twilio_Call_Add_Verify_Call_Delete_Success(t *testing.T) {
+	var called, verified atomic.Bool
+	var code atomic.Pointer[string]
+	twilioVerifyServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		body, err := io.ReadAll(r.Body)
+		require.Nil(t, err)
+		require.Equal(t, "Basic QUMxMjM0NTY3ODkwOkFBRUFBMTIzNDU2Nzg5MA==", r.Header.Get("Authorization"))
+		if r.URL.Path == "/v2/Services/VA1234567890/Verifications" {
+			if code.Load() != nil {
+				t.Fatal("Should be only called once")
+			}
+			require.Equal(t, "Channel=sms&To=%2B12223334444", string(body))
+			code.Store(util.String("123456"))
+		} else if r.URL.Path == "/v2/Services/VA1234567890/VerificationCheck" {
+			if verified.Load() {
+				t.Fatal("Should be only called once")
+			}
+			require.Equal(t, "Code=123456&To=%2B12223334444", string(body))
+			verified.Store(true)
+		} else {
+			t.Fatal("Unexpected path:", r.URL.Path)
+		}
+	}))
+	defer twilioVerifyServer.Close()
+	twilioCallsServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if called.Load() {
+			t.Fatal("Should be only called once")
+		}
+		body, err := io.ReadAll(r.Body)
+		require.Nil(t, err)
+		require.Equal(t, "/2010-04-01/Accounts/AC1234567890/Calls.json", r.URL.Path)
+		require.Equal(t, "Basic QUMxMjM0NTY3ODkwOkFBRUFBMTIzNDU2Nzg5MA==", r.Header.Get("Authorization"))
+		require.Equal(t, "From=%2B1234567890&To=%2B12223334444&Twiml=%0A%3CResponse%3E%0A%09%3CPause+length%3D%221%22%2F%3E%0A%09%3CSay+loop%3D%223%22%3E%0A%09%09You+have+a+message+from+notify+on+topic+mytopic.+Message%3A%0A%09%09%3Cbreak+time%3D%221s%22%2F%3E%0A%09%09hi+there%0A%09%09%3Cbreak+time%3D%221s%22%2F%3E%0A%09%09End+of+message.%0A%09%09%3Cbreak+time%3D%221s%22%2F%3E%0A%09%09This+message+was+sent+by+user+phil.+It+will+be+repeated+three+times.%0A%09%09To+unsubscribe+from+calls+like+this%2C+remove+your+phone+number+in+the+notify+web+app.%0A%09%09%3Cbreak+time%3D%223s%22%2F%3E%0A%09%3C%2FSay%3E%0A%09%3CSay%3EGoodbye.%3C%2FSay%3E%0A%3C%2FResponse%3E", string(body))
+		called.Store(true)
+	}))
+	defer twilioCallsServer.Close()
+
+	c := newTestConfigWithAuthFile(t)
+	c.TwilioVerifyBaseURL = twilioVerifyServer.URL
+	c.TwilioCallsBaseURL = twilioCallsServer.URL
+	c.TwilioAccount = "AC1234567890"
+	c.TwilioAuthToken = "AAEAA1234567890"
+	c.TwilioFromNumber = "+1234567890"
+	c.TwilioVerifyService = "VA1234567890"
+	s := newTestServer(t, c)
+
+	// Add tier and user
+	require.Nil(t, s.userManager.AddTier(&user.Tier{
+		Code:         "pro",
+		MessageLimit: 10,
+		CallLimit:    1,
+	}))
+	require.Nil(t, s.userManager.AddUser("phil", "phil", user.RoleUser))
+	require.Nil(t, s.userManager.ChangeTier("phil", "pro"))
+	u, err := s.userManager.User("phil")
+	require.Nil(t, err)
+
+	// Send verification code for phone number
+	response := request(t, s, "PUT", "/v1/account/phone/verify", `{"number":"+12223334444","channel":"sms"}`, map[string]string{
+		"authorization": util.BasicAuth("phil", "phil"),
+	})
+	require.Equal(t, 200, response.Code)
+	waitFor(t, func() bool {
+		return *code.Load() == "123456"
+	})
+
+	// Add phone number with code
+	response = request(t, s, "PUT", "/v1/account/phone", `{"number":"+12223334444","code":"123456"}`, map[string]string{
+		"authorization": util.BasicAuth("phil", "phil"),
+	})
+	require.Equal(t, 200, response.Code)
+	waitFor(t, func() bool {
+		return verified.Load()
+	})
+	phoneNumbers, err := s.userManager.PhoneNumbers(u.ID)
+	require.Nil(t, err)
+	require.Equal(t, 1, len(phoneNumbers))
+	require.Equal(t, "+12223334444", phoneNumbers[0])
+
+	// Do the thing
+	response = request(t, s, "POST", "/mytopic", "hi there", map[string]string{
+		"authorization": util.BasicAuth("phil", "phil"),
+		"x-call":        "yes",
+	})
+	require.Equal(t, "hi there", toMessage(t, response.Body.String()).Message)
+	waitFor(t, func() bool {
+		return called.Load()
+	})
+
+	// Remove the phone number
+	response = request(t, s, "DELETE", "/v1/account/phone", `{"number":"+12223334444"}`, map[string]string{
+		"authorization": util.BasicAuth("phil", "phil"),
+	})
+	require.Equal(t, 200, response.Code)
+
+	// Verify the phone number is gone from the DB
+	phoneNumbers, err = s.userManager.PhoneNumbers(u.ID)
+	require.Nil(t, err)
+	require.Equal(t, 0, len(phoneNumbers))
+}
+
+func TestServer_Twilio_Call_Success(t *testing.T) {
+	var called atomic.Bool
+	twilioServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if called.Load() {
+			t.Fatal("Should be only called once")
+		}
+		body, err := io.ReadAll(r.Body)
+		require.Nil(t, err)
+		require.Equal(t, "/2010-04-01/Accounts/AC1234567890/Calls.json", r.URL.Path)
+		require.Equal(t, "Basic QUMxMjM0NTY3ODkwOkFBRUFBMTIzNDU2Nzg5MA==", r.Header.Get("Authorization"))
+		require.Equal(t, "From=%2B1234567890&To=%2B11122233344&Twiml=%0A%3CResponse%3E%0A%09%3CPause+length%3D%221%22%2F%3E%0A%09%3CSay+loop%3D%223%22%3E%0A%09%09You+have+a+message+from+notify+on+topic+mytopic.+Message%3A%0A%09%09%3Cbreak+time%3D%221s%22%2F%3E%0A%09%09hi+there%0A%09%09%3Cbreak+time%3D%221s%22%2F%3E%0A%09%09End+of+message.%0A%09%09%3Cbreak+time%3D%221s%22%2F%3E%0A%09%09This+message+was+sent+by+user+phil.+It+will+be+repeated+three+times.%0A%09%09To+unsubscribe+from+calls+like+this%2C+remove+your+phone+number+in+the+notify+web+app.%0A%09%09%3Cbreak+time%3D%223s%22%2F%3E%0A%09%3C%2FSay%3E%0A%09%3CSay%3EGoodbye.%3C%2FSay%3E%0A%3C%2FResponse%3E", string(body))
+		called.Store(true)
+	}))
+	defer twilioServer.Close()
+
+	c := newTestConfigWithAuthFile(t)
+	c.TwilioCallsBaseURL = twilioServer.URL
+	c.TwilioAccount = "AC1234567890"
+	c.TwilioAuthToken = "AAEAA1234567890"
+	c.TwilioFromNumber = "+1234567890"
+	s := newTestServer(t, c)
+
+	// Add tier and user
+	require.Nil(t, s.userManager.AddTier(&user.Tier{
+		Code:         "pro",
+		MessageLimit: 10,
+		CallLimit:    1,
+	}))
+	require.Nil(t, s.userManager.AddUser("phil", "phil", user.RoleUser))
+	require.Nil(t, s.userManager.ChangeTier("phil", "pro"))
+	u, err := s.userManager.User("phil")
+	require.Nil(t, err)
+	require.Nil(t, s.userManager.AddPhoneNumber(u.ID, "+11122233344"))
+
+	// Do the thing
+	response := request(t, s, "POST", "/mytopic", "hi there", map[string]string{
+		"authorization": util.BasicAuth("phil", "phil"),
+		"x-call":        "+11122233344",
+	})
+	require.Equal(t, "hi there", toMessage(t, response.Body.String()).Message)
+	waitFor(t, func() bool {
+		return called.Load()
+	})
+}
+
+func TestServer_Twilio_Call_Success_With_Yes(t *testing.T) {
+	var called atomic.Bool
+	twilioServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if called.Load() {
+			t.Fatal("Should be only called once")
+		}
+		body, err := io.ReadAll(r.Body)
+		require.Nil(t, err)
+		require.Equal(t, "/2010-04-01/Accounts/AC1234567890/Calls.json", r.URL.Path)
+		require.Equal(t, "Basic QUMxMjM0NTY3ODkwOkFBRUFBMTIzNDU2Nzg5MA==", r.Header.Get("Authorization"))
+		require.Equal(t, "From=%2B1234567890&To=%2B11122233344&Twiml=%0A%3CResponse%3E%0A%09%3CPause+length%3D%221%22%2F%3E%0A%09%3CSay+loop%3D%223%22%3E%0A%09%09You+have+a+message+from+notify+on+topic+mytopic.+Message%3A%0A%09%09%3Cbreak+time%3D%221s%22%2F%3E%0A%09%09hi+there%0A%09%09%3Cbreak+time%3D%221s%22%2F%3E%0A%09%09End+of+message.%0A%09%09%3Cbreak+time%3D%221s%22%2F%3E%0A%09%09This+message+was+sent+by+user+phil.+It+will+be+repeated+three+times.%0A%09%09To+unsubscribe+from+calls+like+this%2C+remove+your+phone+number+in+the+notify+web+app.%0A%09%09%3Cbreak+time%3D%223s%22%2F%3E%0A%09%3C%2FSay%3E%0A%09%3CSay%3EGoodbye.%3C%2FSay%3E%0A%3C%2FResponse%3E", string(body))
+		called.Store(true)
+	}))
+	defer twilioServer.Close()
+
+	c := newTestConfigWithAuthFile(t)
+	c.TwilioCallsBaseURL = twilioServer.URL
+	c.TwilioAccount = "AC1234567890"
+	c.TwilioAuthToken = "AAEAA1234567890"
+	c.TwilioFromNumber = "+1234567890"
+	s := newTestServer(t, c)
+
+	// Add tier and user
+	require.Nil(t, s.userManager.AddTier(&user.Tier{
+		Code:         "pro",
+		MessageLimit: 10,
+		CallLimit:    1,
+	}))
+	require.Nil(t, s.userManager.AddUser("phil", "phil", user.RoleUser))
+	require.Nil(t, s.userManager.ChangeTier("phil", "pro"))
+	u, err := s.userManager.User("phil")
+	require.Nil(t, err)
+	require.Nil(t, s.userManager.AddPhoneNumber(u.ID, "+11122233344"))
+
+	// Do the thing
+	response := request(t, s, "POST", "/mytopic", "hi there", map[string]string{
+		"authorization": util.BasicAuth("phil", "phil"),
+		"x-call":        "yes", // <<<------
+	})
+	require.Equal(t, "hi there", toMessage(t, response.Body.String()).Message)
+	waitFor(t, func() bool {
+		return called.Load()
+	})
+}
+
+func TestServer_Twilio_Call_UnverifiedNumber(t *testing.T) {
+	c := newTestConfigWithAuthFile(t)
+	c.TwilioCallsBaseURL = "http://dummy.invalid"
+	c.TwilioAccount = "AC1234567890"
+	c.TwilioAuthToken = "AAEAA1234567890"
+	c.TwilioFromNumber = "+1234567890"
+	s := newTestServer(t, c)
+
+	// Add tier and user
+	require.Nil(t, s.userManager.AddTier(&user.Tier{
+		Code:         "pro",
+		MessageLimit: 10,
+		CallLimit:    1,
+	}))
+	require.Nil(t, s.userManager.AddUser("phil", "phil", user.RoleUser))
+	require.Nil(t, s.userManager.ChangeTier("phil", "pro"))
+
+	// Do the thing
+	response := request(t, s, "POST", "/mytopic", "test", map[string]string{
+		"authorization": util.BasicAuth("phil", "phil"),
+		"x-call":        "+11122233344",
+	})
+	require.Equal(t, 40034, toHTTPError(t, response.Body.String()).Code)
+}
+
+func TestServer_Twilio_Call_InvalidNumber(t *testing.T) {
+	c := newTestConfigWithAuthFile(t)
+	c.TwilioCallsBaseURL = "https://127.0.0.1"
+	c.TwilioAccount = "AC1234567890"
+	c.TwilioAuthToken = "AAEAA1234567890"
+	c.TwilioFromNumber = "+1234567890"
+	s := newTestServer(t, c)
+
+	response := request(t, s, "POST", "/mytopic", "test", map[string]string{
+		"x-call": "+invalid",
+	})
+	require.Equal(t, 40033, toHTTPError(t, response.Body.String()).Code)
+}
+
+func TestServer_Twilio_Call_Anonymous(t *testing.T) {
+	c := newTestConfigWithAuthFile(t)
+	c.TwilioCallsBaseURL = "https://127.0.0.1"
+	c.TwilioAccount = "AC1234567890"
+	c.TwilioAuthToken = "AAEAA1234567890"
+	c.TwilioFromNumber = "+1234567890"
+	s := newTestServer(t, c)
+
+	response := request(t, s, "POST", "/mytopic", "test", map[string]string{
+		"x-call": "+123123",
+	})
+	require.Equal(t, 40035, toHTTPError(t, response.Body.String()).Code)
+}
+
+func TestServer_Twilio_Call_Unconfigured(t *testing.T) {
+	s := newTestServer(t, newTestConfig(t))
+	response := request(t, s, "POST", "/mytopic", "test", map[string]string{
+		"x-call": "+1234",
+	})
+	require.Equal(t, 40032, toHTTPError(t, response.Body.String()).Code)
+}
--- a/server/types.go
+++ b/server/types.go
@ -311,6 +311,16 @@ type apiAccountTokenResponse struct {
 	Expires    int64  `json:"expires,omitempty"` // Unix timestamp
 }

+type apiAccountPhoneNumberVerifyRequest struct {
+	Number  string `json:"number"`
+	Channel string `json:"channel"`
+}
+
+type apiAccountPhoneNumberAddRequest struct {
+	Number string `json:"number"`
+	Code   string `json:"code"` // Only set when adding a phone number
+}
+
 type apiAccountTier struct {
 	Code string `json:"code"`
 	Name string `json:"name"`
@ -321,6 +331,7 @@ type apiAccountLimits struct {
 	Messages                 int64  `json:"messages"`
 	MessagesExpiryDuration   int64  `json:"messages_expiry_duration"`
 	Emails                   int64  `json:"emails"`
+	Calls                    int64  `json:"calls"`
 	Reservations             int64  `json:"reservations"`
 	AttachmentTotalSize      int64  `json:"attachment_total_size"`
 	AttachmentFileSize       int64  `json:"attachment_file_size"`
@ -333,6 +344,8 @@ type apiAccountStats struct {
 	MessagesRemaining            int64 `json:"messages_remaining"`
 	Emails                       int64 `json:"emails"`
 	EmailsRemaining              int64 `json:"emails_remaining"`
+	Calls                        int64 `json:"calls"`
+	CallsRemaining               int64 `json:"calls_remaining"`
 	Reservations                 int64 `json:"reservations"`
 	ReservationsRemaining        int64 `json:"reservations_remaining"`
 	AttachmentTotalSize          int64 `json:"attachment_total_size"`
@ -362,6 +375,7 @@ type apiAccountResponse struct {
 	Subscriptions []*user.Subscription       `json:"subscriptions,omitempty"`
 	Reservations  []*apiAccountReservation   `json:"reservations,omitempty"`
 	Tokens        []*apiAccountTokenResponse `json:"tokens,omitempty"`
+	PhoneNumbers  []string                   `json:"phone_numbers,omitempty"`
 	Tier          *apiAccountTier            `json:"tier,omitempty"`
 	Limits        *apiAccountLimits          `json:"limits,omitempty"`
 	Stats         *apiAccountStats           `json:"stats,omitempty"`
@ -379,6 +393,8 @@ type apiConfigResponse struct {
 	EnableLogin        bool     `json:"enable_login"`
 	EnableSignup       bool     `json:"enable_signup"`
 	EnablePayments     bool     `json:"enable_payments"`
+	EnableCalls        bool     `json:"enable_calls"`
+	EnableEmails       bool     `json:"enable_emails"`
 	EnableReservations bool     `json:"enable_reservations"`
 	BillingContact     string   `json:"billing_contact"`
 	DisallowedTopics   []string `json:"disallowed_topics"`
--- a/server/util.go
+++ b/server/util.go
@ -18,6 +18,14 @@ func readBoolParam(r *http.Request, defaultValue bool, names ...string) bool {
 	if value == "" {
 		return defaultValue
 	}
+	return toBool(value)
+}
+
+func isBoolValue(value string) bool {
+	return value == "1" || value == "yes" || value == "true" || value == "0" || value == "no" || value == "false"
+}
+
+func toBool(value string) bool {
 	return value == "1" || value == "yes" || value == "true"
 }

--- a/server/visitor.go
+++ b/server/visitor.go
@ -24,6 +24,10 @@ const (
 	// visitorDefaultReservationsLimit is the amount of topic names a user without a tier is allowed to reserve.
 	// This number is zero, and changing it may have unintended consequences in the web app, or otherwise
 	visitorDefaultReservationsLimit = int64(0)
+
+	// visitorDefaultCallsLimit is the amount of calls a user without a tier is allowed to make.
+	// This number is zero, because phone numbers have to be verified first.
+	visitorDefaultCallsLimit = int64(0)
 )

 // Constants used to convert a tier-user's MessageLimit (see user.Tier) into adequate request limiter
@ -56,6 +60,7 @@ type visitor struct {
 	requestLimiter      *rate.Limiter      // Rate limiter for (almost) all requests (including messages)
 	messagesLimiter     *util.FixedLimiter // Rate limiter for messages
 	emailsLimiter       *util.RateLimiter  // Rate limiter for emails
+	callsLimiter        *util.FixedLimiter // Rate limiter for calls
 	subscriptionLimiter *util.FixedLimiter // Fixed limiter for active subscriptions (ongoing connections)
 	bandwidthLimiter    *util.RateLimiter  // Limiter for attachment bandwidth downloads
 	accountLimiter      *rate.Limiter      // Rate limiter for account creation, may be nil
@ -79,6 +84,7 @@ type visitorLimits struct {
 	EmailLimit               int64
 	EmailLimitBurst          int
 	EmailLimitReplenish      rate.Limit
+	CallLimit                int64
 	ReservationsLimit        int64
 	AttachmentTotalSizeLimit int64
 	AttachmentFileSizeLimit  int64
@ -91,6 +97,8 @@ type visitorStats struct {
 	MessagesRemaining            int64
 	Emails                       int64
 	EmailsRemaining              int64
+	Calls                        int64
+	CallsRemaining               int64
 	Reservations                 int64
 	ReservationsRemaining        int64
 	AttachmentTotalSize          int64
@ -107,10 +115,11 @@ const (
 )

 func newVisitor(conf *Config, messageCache *messageCache, userManager *user.Manager, ip netip.Addr, user *user.User) *visitor {
-	var messages, emails int64
+	var messages, emails, calls int64
 	if user != nil {
 		messages = user.Stats.Messages
 		emails = user.Stats.Emails
+		calls = user.Stats.Calls
 	}
 	v := &visitor{
 		config:              conf,
@ -124,11 +133,12 @@ func newVisitor(conf *Config, messageCache *messageCache, userManager *user.Mana
 		requestLimiter:      nil, // Set in resetLimiters
 		messagesLimiter:     nil, // Set in resetLimiters, may be nil
 		emailsLimiter:       nil, // Set in resetLimiters
+		callsLimiter:        nil, // Set in resetLimiters, may be nil
 		bandwidthLimiter:    nil, // Set in resetLimiters
 		accountLimiter:      nil, // Set in resetLimiters, may be nil
 		authLimiter:         nil, // Set in resetLimiters, may be nil
 	}
-	v.resetLimitersNoLock(messages, emails, false)
+	v.resetLimitersNoLock(messages, emails, calls, false)
 	return v
 }

@ -147,12 +157,19 @@ func (v *visitor) contextNoLock() log.Context {
 		"visitor_messages":               info.Stats.Messages,
 		"visitor_messages_limit":         info.Limits.MessageLimit,
 		"visitor_messages_remaining":     info.Stats.MessagesRemaining,
-		"visitor_emails":                 info.Stats.Emails,
-		"visitor_emails_limit":           info.Limits.EmailLimit,
-		"visitor_emails_remaining":       info.Stats.EmailsRemaining,
 		"visitor_request_limiter_limit":  v.requestLimiter.Limit(),
 		"visitor_request_limiter_tokens": v.requestLimiter.Tokens(),
 	}
+	if v.config.SMTPSenderFrom != "" {
+		fields["visitor_emails"] = info.Stats.Emails
+		fields["visitor_emails_limit"] = info.Limits.EmailLimit
+		fields["visitor_emails_remaining"] = info.Stats.EmailsRemaining
+	}
+	if v.config.TwilioAccount != "" {
+		fields["visitor_calls"] = info.Stats.Calls
+		fields["visitor_calls_limit"] = info.Limits.CallLimit
+		fields["visitor_calls_remaining"] = info.Stats.CallsRemaining
+	}
 	if v.authLimiter != nil {
 		fields["visitor_auth_limiter_limit"] = v.authLimiter.Limit()
 		fields["visitor_auth_limiter_tokens"] = v.authLimiter.Tokens()
@ -216,6 +233,12 @@ func (v *visitor) EmailAllowed() bool {
 	return v.emailsLimiter.Allow()
 }

+func (v *visitor) CallAllowed() bool {
+	v.mu.RLock() // limiters could be replaced!
+	defer v.mu.RUnlock()
+	return v.callsLimiter.Allow()
+}
+
 func (v *visitor) SubscriptionAllowed() bool {
 	v.mu.RLock() // limiters could be replaced!
 	defer v.mu.RUnlock()
@ -296,6 +319,7 @@ func (v *visitor) Stats() *user.Stats {
 	return &user.Stats{
 		Messages: v.messagesLimiter.Value(),
 		Emails:   v.emailsLimiter.Value(),
+		Calls:    v.callsLimiter.Value(),
 	}
 }

@ -304,6 +328,7 @@ func (v *visitor) ResetStats() {
 	defer v.mu.RUnlock()
 	v.emailsLimiter.Reset()
 	v.messagesLimiter.Reset()
+	v.callsLimiter.Reset()
 }

 // User returns the visitor user, or nil if there is none
@ -334,11 +359,11 @@ func (v *visitor) SetUser(u *user.User) {
 	shouldResetLimiters := v.user.TierID() != u.TierID() // TierID works with nil receiver
 	v.user = u                                           // u may be nil!
 	if shouldResetLimiters {
-		var messages, emails int64
+		var messages, emails, calls int64
 		if u != nil {
-			messages, emails = u.Stats.Messages, u.Stats.Emails
+			messages, emails, calls = u.Stats.Messages, u.Stats.Emails, u.Stats.Calls
 		}
-		v.resetLimitersNoLock(messages, emails, true)
+		v.resetLimitersNoLock(messages, emails, calls, true)
 	}
 }

@ -353,11 +378,12 @@ func (v *visitor) MaybeUserID() string {
 	return ""
 }

-func (v *visitor) resetLimitersNoLock(messages, emails int64, enqueueUpdate bool) {
+func (v *visitor) resetLimitersNoLock(messages, emails, calls int64, enqueueUpdate bool) {
 	limits := v.limitsNoLock()
 	v.requestLimiter = rate.NewLimiter(limits.RequestLimitReplenish, limits.RequestLimitBurst)
 	v.messagesLimiter = util.NewFixedLimiterWithValue(limits.MessageLimit, messages)
 	v.emailsLimiter = util.NewRateLimiterWithValue(limits.EmailLimitReplenish, limits.EmailLimitBurst, emails)
+	v.callsLimiter = util.NewFixedLimiterWithValue(limits.CallLimit, calls)
 	v.bandwidthLimiter = util.NewBytesLimiter(int(limits.AttachmentBandwidthLimit), oneDay)
 	if v.user == nil {
 		v.accountLimiter = rate.NewLimiter(rate.Every(v.config.VisitorAccountCreationLimitReplenish), v.config.VisitorAccountCreationLimitBurst)
@ -370,6 +396,7 @@ func (v *visitor) resetLimitersNoLock(messages, emails int64, enqueueUpdate bool
 		go v.userManager.EnqueueUserStats(v.user.ID, &user.Stats{
 			Messages: messages,
 			Emails:   emails,
+			Calls:    calls,
 		})
 	}
 	log.Fields(v.contextNoLock()).Debug("Rate limiters reset for visitor") // Must be after function, because contextNoLock() describes rate limiters
@ -398,6 +425,7 @@ func tierBasedVisitorLimits(conf *Config, tier *user.Tier) *visitorLimits {
 		EmailLimit:               tier.EmailLimit,
 		EmailLimitBurst:          util.MinMax(int(float64(tier.EmailLimit)*visitorEmailLimitBurstRate), conf.VisitorEmailLimitBurst, visitorEmailLimitBurstMax),
 		EmailLimitReplenish:      dailyLimitToRate(tier.EmailLimit),
+		CallLimit:                tier.CallLimit,
 		ReservationsLimit:        tier.ReservationLimit,
 		AttachmentTotalSizeLimit: tier.AttachmentTotalSizeLimit,
 		AttachmentFileSizeLimit:  tier.AttachmentFileSizeLimit,
@ -420,6 +448,7 @@ func configBasedVisitorLimits(conf *Config) *visitorLimits {
 		EmailLimit:               replenishDurationToDailyLimit(conf.VisitorEmailLimitReplenish), // Approximation!
 		EmailLimitBurst:          conf.VisitorEmailLimitBurst,
 		EmailLimitReplenish:      rate.Every(conf.VisitorEmailLimitReplenish),
+		CallLimit:                visitorDefaultCallsLimit,
 		ReservationsLimit:        visitorDefaultReservationsLimit,
 		AttachmentTotalSizeLimit: conf.VisitorAttachmentTotalSizeLimit,
 		AttachmentFileSizeLimit:  conf.AttachmentFileSizeLimit,
@ -465,12 +494,15 @@ func (v *visitor) Info() (*visitorInfo, error) {
 func (v *visitor) infoLightNoLock() *visitorInfo {
 	messages := v.messagesLimiter.Value()
 	emails := v.emailsLimiter.Value()
+	calls := v.callsLimiter.Value()
 	limits := v.limitsNoLock()
 	stats := &visitorStats{
 		Messages:          messages,
 		MessagesRemaining: zeroIfNegative(limits.MessageLimit - messages),
 		Emails:            emails,
 		EmailsRemaining:   zeroIfNegative(limits.EmailLimit - emails),
+		Calls:             calls,
+		CallsRemaining:    zeroIfNegative(limits.CallLimit - calls),
 	}
 	return &visitorInfo{
 		Limits: limits,
--- a/user/manager.go
+++ b/user/manager.go
@ -6,7 +6,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	_ "github.com/mattn/go-sqlite3" // SQLite driver
+	"github.com/mattn/go-sqlite3"
 	"github.com/stripe/stripe-go/v74"
 	"golang.org/x/crypto/bcrypt"
 	"heckel.io/ntfy/log"
@ -55,6 +55,7 @@ const (
 			messages_limit INT NOT NULL,
 			messages_expiry_duration INT NOT NULL,
 			emails_limit INT NOT NULL,
+			calls_limit INT NOT NULL,
 			reservations_limit INT NOT NULL,
 			attachment_file_size_limit INT NOT NULL,
 			attachment_total_size_limit INT NOT NULL,
@ -76,6 +77,7 @@ const (
 			sync_topic TEXT NOT NULL,
 			stats_messages INT NOT NULL DEFAULT (0),
 			stats_emails INT NOT NULL DEFAULT (0),
+			stats_calls INT NOT NULL DEFAULT (0),
 			stripe_customer_id TEXT,
 			stripe_subscription_id TEXT,
 			stripe_subscription_status TEXT,
@ -109,6 +111,12 @@ const (
 			PRIMARY KEY (user_id, token),
 			FOREIGN KEY (user_id) REFERENCES user (id) ON DELETE CASCADE
 		);
+		CREATE TABLE IF NOT EXISTS user_phone (
+			user_id TEXT NOT NULL,
+			phone_number TEXT NOT NULL,
+			PRIMARY KEY (user_id, phone_number),
+			FOREIGN KEY (user_id) REFERENCES user (id) ON DELETE CASCADE
+		);
 		CREATE TABLE IF NOT EXISTS schemaVersion (
 			id INT PRIMARY KEY,
 			version INT NOT NULL
@ -123,26 +131,26 @@ const (
 	`

 	selectUserByIDQuery = `
-		SELECT u.id, u.user, u.pass, u.role, u.prefs, u.sync_topic, u.stats_messages, u.stats_emails, u.stripe_customer_id, u.stripe_subscription_id, u.stripe_subscription_status, u.stripe_subscription_interval, u.stripe_subscription_paid_until, u.stripe_subscription_cancel_at, deleted, t.id, t.code, t.name, t.messages_limit, t.messages_expiry_duration, t.emails_limit, t.reservations_limit, t.attachment_file_size_limit, t.attachment_total_size_limit, t.attachment_expiry_duration, t.attachment_bandwidth_limit, t.stripe_monthly_price_id, t.stripe_yearly_price_id
+		SELECT u.id, u.user, u.pass, u.role, u.prefs, u.sync_topic, u.stats_messages, u.stats_emails, u.stats_calls, u.stripe_customer_id, u.stripe_subscription_id, u.stripe_subscription_status, u.stripe_subscription_interval, u.stripe_subscription_paid_until, u.stripe_subscription_cancel_at, deleted, t.id, t.code, t.name, t.messages_limit, t.messages_expiry_duration, t.emails_limit, t.calls_limit, t.reservations_limit, t.attachment_file_size_limit, t.attachment_total_size_limit, t.attachment_expiry_duration, t.attachment_bandwidth_limit, t.stripe_monthly_price_id, t.stripe_yearly_price_id
 		FROM user u
 		LEFT JOIN tier t on t.id = u.tier_id
 		WHERE u.id = ?
 	`
 	selectUserByNameQuery = `
-		SELECT u.id, u.user, u.pass, u.role, u.prefs, u.sync_topic, u.stats_messages, u.stats_emails, u.stripe_customer_id, u.stripe_subscription_id, u.stripe_subscription_status, u.stripe_subscription_interval, u.stripe_subscription_paid_until, u.stripe_subscription_cancel_at, deleted, t.id, t.code, t.name, t.messages_limit, t.messages_expiry_duration, t.emails_limit, t.reservations_limit, t.attachment_file_size_limit, t.attachment_total_size_limit, t.attachment_expiry_duration, t.attachment_bandwidth_limit, t.stripe_monthly_price_id, t.stripe_yearly_price_id
+		SELECT u.id, u.user, u.pass, u.role, u.prefs, u.sync_topic, u.stats_messages, u.stats_emails, u.stats_calls, u.stripe_customer_id, u.stripe_subscription_id, u.stripe_subscription_status, u.stripe_subscription_interval, u.stripe_subscription_paid_until, u.stripe_subscription_cancel_at, deleted, t.id, t.code, t.name, t.messages_limit, t.messages_expiry_duration, t.emails_limit, t.calls_limit, t.reservations_limit, t.attachment_file_size_limit, t.attachment_total_size_limit, t.attachment_expiry_duration, t.attachment_bandwidth_limit, t.stripe_monthly_price_id, t.stripe_yearly_price_id
 		FROM user u
 		LEFT JOIN tier t on t.id = u.tier_id
 		WHERE user = ?
 	`
 	selectUserByTokenQuery = `
-		SELECT u.id, u.user, u.pass, u.role, u.prefs, u.sync_topic, u.stats_messages, u.stats_emails, u.stripe_customer_id, u.stripe_subscription_id, u.stripe_subscription_status, u.stripe_subscription_interval, u.stripe_subscription_paid_until, u.stripe_subscription_cancel_at, deleted, t.id, t.code, t.name, t.messages_limit, t.messages_expiry_duration, t.emails_limit, t.reservations_limit, t.attachment_file_size_limit, t.attachment_total_size_limit, t.attachment_expiry_duration, t.attachment_bandwidth_limit, t.stripe_monthly_price_id, t.stripe_yearly_price_id
+		SELECT u.id, u.user, u.pass, u.role, u.prefs, u.sync_topic, u.stats_messages, u.stats_emails, u.stats_calls, u.stripe_customer_id, u.stripe_subscription_id, u.stripe_subscription_status, u.stripe_subscription_interval, u.stripe_subscription_paid_until, u.stripe_subscription_cancel_at, deleted, t.id, t.code, t.name, t.messages_limit, t.messages_expiry_duration, t.emails_limit, t.calls_limit, t.reservations_limit, t.attachment_file_size_limit, t.attachment_total_size_limit, t.attachment_expiry_duration, t.attachment_bandwidth_limit, t.stripe_monthly_price_id, t.stripe_yearly_price_id
 		FROM user u
 		JOIN user_token tk on u.id = tk.user_id
 		LEFT JOIN tier t on t.id = u.tier_id
 		WHERE tk.token = ? AND (tk.expires = 0 OR tk.expires >= ?)
 	`
 	selectUserByStripeCustomerIDQuery = `
-		SELECT u.id, u.user, u.pass, u.role, u.prefs, u.sync_topic, u.stats_messages, u.stats_emails, u.stripe_customer_id, u.stripe_subscription_id, u.stripe_subscription_status, u.stripe_subscription_interval, u.stripe_subscription_paid_until, u.stripe_subscription_cancel_at, deleted, t.id, t.code, t.name, t.messages_limit, t.messages_expiry_duration, t.emails_limit, t.reservations_limit, t.attachment_file_size_limit, t.attachment_total_size_limit, t.attachment_expiry_duration, t.attachment_bandwidth_limit, t.stripe_monthly_price_id, t.stripe_yearly_price_id
+		SELECT u.id, u.user, u.pass, u.role, u.prefs, u.sync_topic, u.stats_messages, u.stats_emails, u.stats_calls, u.stripe_customer_id, u.stripe_subscription_id, u.stripe_subscription_status, u.stripe_subscription_interval, u.stripe_subscription_paid_until, u.stripe_subscription_cancel_at, deleted, t.id, t.code, t.name, t.messages_limit, t.messages_expiry_duration, t.emails_limit, t.calls_limit, t.reservations_limit, t.attachment_file_size_limit, t.attachment_total_size_limit, t.attachment_expiry_duration, t.attachment_bandwidth_limit, t.stripe_monthly_price_id, t.stripe_yearly_price_id
 		FROM user u
 		LEFT JOIN tier t on t.id = u.tier_id
 		WHERE u.stripe_customer_id = ?
@ -173,8 +181,8 @@ const (
 	updateUserPassQuery          = `UPDATE user SET pass = ? WHERE user = ?`
 	updateUserRoleQuery          = `UPDATE user SET role = ? WHERE user = ?`
 	updateUserPrefsQuery         = `UPDATE user SET prefs = ? WHERE id = ?`
-	updateUserStatsQuery         = `UPDATE user SET stats_messages = ?, stats_emails = ? WHERE id = ?`
-	updateUserStatsResetAllQuery = `UPDATE user SET stats_messages = 0, stats_emails = 0`
+	updateUserStatsQuery         = `UPDATE user SET stats_messages = ?, stats_emails = ?, stats_calls = ? WHERE id = ?`
+	updateUserStatsResetAllQuery = `UPDATE user SET stats_messages = 0, stats_emails = 0, stats_calls = 0`
 	updateUserDeletedQuery       = `UPDATE user SET deleted = ? WHERE id = ?`
 	deleteUsersMarkedQuery       = `DELETE FROM user WHERE deleted < ?`
 	deleteUserQuery              = `DELETE FROM user WHERE user = ?`
@ -262,26 +270,30 @@ const (
 		)
 	`

+	selectPhoneNumbersQuery = `SELECT phone_number FROM user_phone WHERE user_id = ?`
+	insertPhoneNumberQuery  = `INSERT INTO user_phone (user_id, phone_number) VALUES (?, ?)`
+	deletePhoneNumberQuery  = `DELETE FROM user_phone WHERE user_id = ? AND phone_number = ?`
+
 	insertTierQuery = `
-		INSERT INTO tier (id, code, name, messages_limit, messages_expiry_duration, emails_limit, reservations_limit, attachment_file_size_limit, attachment_total_size_limit, attachment_expiry_duration, attachment_bandwidth_limit, stripe_monthly_price_id, stripe_yearly_price_id)
-		VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+		INSERT INTO tier (id, code, name, messages_limit, messages_expiry_duration, emails_limit, calls_limit, reservations_limit, attachment_file_size_limit, attachment_total_size_limit, attachment_expiry_duration, attachment_bandwidth_limit, stripe_monthly_price_id, stripe_yearly_price_id)
+		VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
 	`
 	updateTierQuery = `
 		UPDATE tier
-		SET name = ?, messages_limit = ?, messages_expiry_duration = ?, emails_limit = ?, reservations_limit = ?, attachment_file_size_limit = ?, attachment_total_size_limit = ?, attachment_expiry_duration = ?, attachment_bandwidth_limit = ?, stripe_monthly_price_id = ?, stripe_yearly_price_id = ?
+		SET name = ?, messages_limit = ?, messages_expiry_duration = ?, emails_limit = ?, calls_limit = ?, reservations_limit = ?, attachment_file_size_limit = ?, attachment_total_size_limit = ?, attachment_expiry_duration = ?, attachment_bandwidth_limit = ?, stripe_monthly_price_id = ?, stripe_yearly_price_id = ?
 		WHERE code = ?
 	`
 	selectTiersQuery = `
-		SELECT id, code, name, messages_limit, messages_expiry_duration, emails_limit, reservations_limit, attachment_file_size_limit, attachment_total_size_limit, attachment_expiry_duration, attachment_bandwidth_limit, stripe_monthly_price_id, stripe_yearly_price_id
+		SELECT id, code, name, messages_limit, messages_expiry_duration, emails_limit, calls_limit, reservations_limit, attachment_file_size_limit, attachment_total_size_limit, attachment_expiry_duration, attachment_bandwidth_limit, stripe_monthly_price_id, stripe_yearly_price_id
 		FROM tier
 	`
 	selectTierByCodeQuery = `
-		SELECT id, code, name, messages_limit, messages_expiry_duration, emails_limit, reservations_limit, attachment_file_size_limit, attachment_total_size_limit, attachment_expiry_duration, attachment_bandwidth_limit, stripe_monthly_price_id, stripe_yearly_price_id
+		SELECT id, code, name, messages_limit, messages_expiry_duration, emails_limit, calls_limit, reservations_limit, attachment_file_size_limit, attachment_total_size_limit, attachment_expiry_duration, attachment_bandwidth_limit, stripe_monthly_price_id, stripe_yearly_price_id
 		FROM tier
 		WHERE code = ?
 	`
 	selectTierByPriceIDQuery = `
-		SELECT id, code, name, messages_limit, messages_expiry_duration, emails_limit, reservations_limit, attachment_file_size_limit, attachment_total_size_limit, attachment_expiry_duration, attachment_bandwidth_limit, stripe_monthly_price_id, stripe_yearly_price_id
+		SELECT id, code, name, messages_limit, messages_expiry_duration, emails_limit, calls_limit, reservations_limit, attachment_file_size_limit, attachment_total_size_limit, attachment_expiry_duration, attachment_bandwidth_limit, stripe_monthly_price_id, stripe_yearly_price_id
 		FROM tier
 		WHERE (stripe_monthly_price_id = ? OR stripe_yearly_price_id = ?)
 	`
@ -298,7 +310,7 @@ const (

 // Schema management queries
 const (
-	currentSchemaVersion     = 3
+	currentSchemaVersion     = 4
 	insertSchemaVersion      = `INSERT INTO schemaVersion VALUES (1, ?)`
 	updateSchemaVersion      = `UPDATE schemaVersion SET version = ? WHERE id = 1`
 	selectSchemaVersionQuery = `SELECT version FROM schemaVersion WHERE id = 1`
@ -396,12 +408,25 @@ const (
 		CREATE UNIQUE INDEX idx_tier_stripe_monthly_price_id ON tier (stripe_monthly_price_id);
 		CREATE UNIQUE INDEX idx_tier_stripe_yearly_price_id ON tier (stripe_yearly_price_id);
 	`
+
+	// 3 -> 4
+	migrate3To4UpdateQueries = `
+		ALTER TABLE tier ADD COLUMN calls_limit INT NOT NULL DEFAULT (0);
+		ALTER TABLE user ADD COLUMN stats_calls INT NOT NULL DEFAULT (0);
+		CREATE TABLE IF NOT EXISTS user_phone (
+			user_id TEXT NOT NULL,
+			phone_number TEXT NOT NULL,
+			PRIMARY KEY (user_id, phone_number),
+			FOREIGN KEY (user_id) REFERENCES user (id) ON DELETE CASCADE
+		);
+	`
 )

 var (
 	migrations = map[int]func(db *sql.DB) error{
 		1: migrateFrom1,
 		2: migrateFrom2,
+		3: migrateFrom3,
 	}
 )

@ -623,6 +648,56 @@ func (a *Manager) RemoveExpiredTokens() error {
 	return nil
 }

+// PhoneNumbers returns all phone numbers for the user with the given user ID
+func (a *Manager) PhoneNumbers(userID string) ([]string, error) {
+	rows, err := a.db.Query(selectPhoneNumbersQuery, userID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	phoneNumbers := make([]string, 0)
+	for {
+		phoneNumber, err := a.readPhoneNumber(rows)
+		if err == ErrPhoneNumberNotFound {
+			break
+		} else if err != nil {
+			return nil, err
+		}
+		phoneNumbers = append(phoneNumbers, phoneNumber)
+	}
+	return phoneNumbers, nil
+}
+
+func (a *Manager) readPhoneNumber(rows *sql.Rows) (string, error) {
+	var phoneNumber string
+	if !rows.Next() {
+		return "", ErrPhoneNumberNotFound
+	}
+	if err := rows.Scan(&phoneNumber); err != nil {
+		return "", err
+	} else if err := rows.Err(); err != nil {
+		return "", err
+	}
+	return phoneNumber, nil
+}
+
+// AddPhoneNumber adds a phone number to the user with the given user ID
+func (a *Manager) AddPhoneNumber(userID string, phoneNumber string) error {
+	if _, err := a.db.Exec(insertPhoneNumberQuery, userID, phoneNumber); err != nil {
+		if sqliteErr, ok := err.(sqlite3.Error); ok && sqliteErr.ExtendedCode == sqlite3.ErrConstraintUnique {
+			return ErrPhoneNumberExists
+		}
+		return err
+	}
+	return nil
+}
+
+// RemovePhoneNumber deletes a phone number from the user with the given user ID
+func (a *Manager) RemovePhoneNumber(userID string, phoneNumber string) error {
+	_, err := a.db.Exec(deletePhoneNumberQuery, userID, phoneNumber)
+	return err
+}
+
 // RemoveDeletedUsers deletes all users that have been marked deleted for
 func (a *Manager) RemoveDeletedUsers() error {
 	if _, err := a.db.Exec(deleteUsersMarkedQuery, time.Now().Unix()); err != nil {
@ -705,9 +780,10 @@ func (a *Manager) writeUserStatsQueue() error {
 				"user_id":        userID,
 				"messages_count": update.Messages,
 				"emails_count":   update.Emails,
+				"calls_count":    update.Calls,
 			}).
 			Trace("Updating stats for user %s", userID)
-		if _, err := tx.Exec(updateUserStatsQuery, update.Messages, update.Emails, userID); err != nil {
+		if _, err := tx.Exec(updateUserStatsQuery, update.Messages, update.Emails, update.Calls, userID); err != nil {
 			return err
 		}
 	}
@ -789,6 +865,9 @@ func (a *Manager) AddUser(username, password string, role Role) error {
 	userID := util.RandomStringPrefix(userIDPrefix, userIDLength)
 	syncTopic, now := util.RandomStringPrefix(syncTopicPrefix, syncTopicLength), time.Now().Unix()
 	if _, err = a.db.Exec(insertUserQuery, userID, username, hash, role, syncTopic, now); err != nil {
+		if sqliteErr, ok := err.(sqlite3.Error); ok && sqliteErr.ExtendedCode == sqlite3.ErrConstraintUnique {
+			return ErrUserExists
+		}
 		return err
 	}
 	return nil
@ -916,12 +995,12 @@ func (a *Manager) readUser(rows *sql.Rows) (*User, error) {
 	defer rows.Close()
 	var id, username, hash, role, prefs, syncTopic string
 	var stripeCustomerID, stripeSubscriptionID, stripeSubscriptionStatus, stripeSubscriptionInterval, stripeMonthlyPriceID, stripeYearlyPriceID, tierID, tierCode, tierName sql.NullString
-	var messages, emails int64
-	var messagesLimit, messagesExpiryDuration, emailsLimit, reservationsLimit, attachmentFileSizeLimit, attachmentTotalSizeLimit, attachmentExpiryDuration, attachmentBandwidthLimit, stripeSubscriptionPaidUntil, stripeSubscriptionCancelAt, deleted sql.NullInt64
+	var messages, emails, calls int64
+	var messagesLimit, messagesExpiryDuration, emailsLimit, callsLimit, reservationsLimit, attachmentFileSizeLimit, attachmentTotalSizeLimit, attachmentExpiryDuration, attachmentBandwidthLimit, stripeSubscriptionPaidUntil, stripeSubscriptionCancelAt, deleted sql.NullInt64
 	if !rows.Next() {
 		return nil, ErrUserNotFound
 	}
-	if err := rows.Scan(&id, &username, &hash, &role, &prefs, &syncTopic, &messages, &emails, &stripeCustomerID, &stripeSubscriptionID, &stripeSubscriptionStatus, &stripeSubscriptionInterval, &stripeSubscriptionPaidUntil, &stripeSubscriptionCancelAt, &deleted, &tierID, &tierCode, &tierName, &messagesLimit, &messagesExpiryDuration, &emailsLimit, &reservationsLimit, &attachmentFileSizeLimit, &attachmentTotalSizeLimit, &attachmentExpiryDuration, &attachmentBandwidthLimit, &stripeMonthlyPriceID, &stripeYearlyPriceID); err != nil {
+	if err := rows.Scan(&id, &username, &hash, &role, &prefs, &syncTopic, &messages, &emails, &calls, &stripeCustomerID, &stripeSubscriptionID, &stripeSubscriptionStatus, &stripeSubscriptionInterval, &stripeSubscriptionPaidUntil, &stripeSubscriptionCancelAt, &deleted, &tierID, &tierCode, &tierName, &messagesLimit, &messagesExpiryDuration, &emailsLimit, &callsLimit, &reservationsLimit, &attachmentFileSizeLimit, &attachmentTotalSizeLimit, &attachmentExpiryDuration, &attachmentBandwidthLimit, &stripeMonthlyPriceID, &stripeYearlyPriceID); err != nil {
 		return nil, err
 	} else if err := rows.Err(); err != nil {
 		return nil, err
@ -936,6 +1015,7 @@ func (a *Manager) readUser(rows *sql.Rows) (*User, error) {
 		Stats: &Stats{
 			Messages: messages,
 			Emails:   emails,
+			Calls:    calls,
 		},
 		Billing: &Billing{
 			StripeCustomerID:            stripeCustomerID.String,                                          // May be empty
@ -959,6 +1039,7 @@ func (a *Manager) readUser(rows *sql.Rows) (*User, error) {
 			MessageLimit:             messagesLimit.Int64,
 			MessageExpiryDuration:    time.Duration(messagesExpiryDuration.Int64) * time.Second,
 			EmailLimit:               emailsLimit.Int64,
+			CallLimit:                callsLimit.Int64,
 			ReservationLimit:         reservationsLimit.Int64,
 			AttachmentFileSizeLimit:  attachmentFileSizeLimit.Int64,
 			AttachmentTotalSizeLimit: attachmentTotalSizeLimit.Int64,
@ -1291,7 +1372,7 @@ func (a *Manager) AddTier(tier *Tier) error {
 	if tier.ID == "" {
 		tier.ID = util.RandomStringPrefix(tierIDPrefix, tierIDLength)
 	}
-	if _, err := a.db.Exec(insertTierQuery, tier.ID, tier.Code, tier.Name, tier.MessageLimit, int64(tier.MessageExpiryDuration.Seconds()), tier.EmailLimit, tier.ReservationLimit, tier.AttachmentFileSizeLimit, tier.AttachmentTotalSizeLimit, int64(tier.AttachmentExpiryDuration.Seconds()), tier.AttachmentBandwidthLimit, nullString(tier.StripeMonthlyPriceID), nullString(tier.StripeYearlyPriceID)); err != nil {
+	if _, err := a.db.Exec(insertTierQuery, tier.ID, tier.Code, tier.Name, tier.MessageLimit, int64(tier.MessageExpiryDuration.Seconds()), tier.EmailLimit, tier.CallLimit, tier.ReservationLimit, tier.AttachmentFileSizeLimit, tier.AttachmentTotalSizeLimit, int64(tier.AttachmentExpiryDuration.Seconds()), tier.AttachmentBandwidthLimit, nullString(tier.StripeMonthlyPriceID), nullString(tier.StripeYearlyPriceID)); err != nil {
 		return err
 	}
 	return nil
@ -1299,7 +1380,7 @@ func (a *Manager) AddTier(tier *Tier) error {

 // UpdateTier updates a tier's properties in the database
 func (a *Manager) UpdateTier(tier *Tier) error {
-	if _, err := a.db.Exec(updateTierQuery, tier.Name, tier.MessageLimit, int64(tier.MessageExpiryDuration.Seconds()), tier.EmailLimit, tier.ReservationLimit, tier.AttachmentFileSizeLimit, tier.AttachmentTotalSizeLimit, int64(tier.AttachmentExpiryDuration.Seconds()), tier.AttachmentBandwidthLimit, nullString(tier.StripeMonthlyPriceID), nullString(tier.StripeYearlyPriceID), tier.Code); err != nil {
+	if _, err := a.db.Exec(updateTierQuery, tier.Name, tier.MessageLimit, int64(tier.MessageExpiryDuration.Seconds()), tier.EmailLimit, tier.CallLimit, tier.ReservationLimit, tier.AttachmentFileSizeLimit, tier.AttachmentTotalSizeLimit, int64(tier.AttachmentExpiryDuration.Seconds()), tier.AttachmentBandwidthLimit, nullString(tier.StripeMonthlyPriceID), nullString(tier.StripeYearlyPriceID), tier.Code); err != nil {
 		return err
 	}
 	return nil
@ -1368,11 +1449,11 @@ func (a *Manager) TierByStripePrice(priceID string) (*Tier, error) {
 func (a *Manager) readTier(rows *sql.Rows) (*Tier, error) {
 	var id, code, name string
 	var stripeMonthlyPriceID, stripeYearlyPriceID sql.NullString
-	var messagesLimit, messagesExpiryDuration, emailsLimit, reservationsLimit, attachmentFileSizeLimit, attachmentTotalSizeLimit, attachmentExpiryDuration, attachmentBandwidthLimit sql.NullInt64
+	var messagesLimit, messagesExpiryDuration, emailsLimit, callsLimit, reservationsLimit, attachmentFileSizeLimit, attachmentTotalSizeLimit, attachmentExpiryDuration, attachmentBandwidthLimit sql.NullInt64
 	if !rows.Next() {
 		return nil, ErrTierNotFound
 	}
-	if err := rows.Scan(&id, &code, &name, &messagesLimit, &messagesExpiryDuration, &emailsLimit, &reservationsLimit, &attachmentFileSizeLimit, &attachmentTotalSizeLimit, &attachmentExpiryDuration, &attachmentBandwidthLimit, &stripeMonthlyPriceID, &stripeYearlyPriceID); err != nil {
+	if err := rows.Scan(&id, &code, &name, &messagesLimit, &messagesExpiryDuration, &emailsLimit, &callsLimit, &reservationsLimit, &attachmentFileSizeLimit, &attachmentTotalSizeLimit, &attachmentExpiryDuration, &attachmentBandwidthLimit, &stripeMonthlyPriceID, &stripeYearlyPriceID); err != nil {
 		return nil, err
 	} else if err := rows.Err(); err != nil {
 		return nil, err
@ -1385,6 +1466,7 @@ func (a *Manager) readTier(rows *sql.Rows) (*Tier, error) {
 		MessageLimit:             messagesLimit.Int64,
 		MessageExpiryDuration:    time.Duration(messagesExpiryDuration.Int64) * time.Second,
 		EmailLimit:               emailsLimit.Int64,
+		CallLimit:                callsLimit.Int64,
 		ReservationLimit:         reservationsLimit.Int64,
 		AttachmentFileSizeLimit:  attachmentFileSizeLimit.Int64,
 		AttachmentTotalSizeLimit: attachmentTotalSizeLimit.Int64,
@ -1527,6 +1609,22 @@ func migrateFrom2(db *sql.DB) error {
 	return tx.Commit()
 }

+func migrateFrom3(db *sql.DB) error {
+	log.Tag(tag).Info("Migrating user database schema: from 3 to 4")
+	tx, err := db.Begin()
+	if err != nil {
+		return err
+	}
+	defer tx.Rollback()
+	if _, err := tx.Exec(migrate3To4UpdateQueries); err != nil {
+		return err
+	}
+	if _, err := tx.Exec(updateSchemaVersion, 4); err != nil {
+		return err
+	}
+	return tx.Commit()
+}
+
 func nullString(s string) sql.NullString {
 	if s == "" {
 		return sql.NullString{}
--- a/user/manager_test.go
+++ b/user/manager_test.go
@ -893,6 +893,44 @@ func TestManager_Tier_Change_And_Reset(t *testing.T) {
 	require.Nil(t, a.ResetTier("phil"))
 }

+func TestUser_PhoneNumberAddListRemove(t *testing.T) {
+	a := newTestManager(t, PermissionDenyAll)
+
+	require.Nil(t, a.AddUser("phil", "phil", RoleUser))
+	phil, err := a.User("phil")
+	require.Nil(t, err)
+	require.Nil(t, a.AddPhoneNumber(phil.ID, "+1234567890"))
+
+	phoneNumbers, err := a.PhoneNumbers(phil.ID)
+	require.Nil(t, err)
+	require.Equal(t, 1, len(phoneNumbers))
+	require.Equal(t, "+1234567890", phoneNumbers[0])
+
+	require.Nil(t, a.RemovePhoneNumber(phil.ID, "+1234567890"))
+	phoneNumbers, err = a.PhoneNumbers(phil.ID)
+	require.Nil(t, err)
+	require.Equal(t, 0, len(phoneNumbers))
+
+	// Paranoia check: We do NOT want to keep phone numbers in there
+	rows, err := a.db.Query(`SELECT * FROM user_phone`)
+	require.Nil(t, err)
+	require.False(t, rows.Next())
+	require.Nil(t, rows.Close())
+}
+
+func TestUser_PhoneNumberAdd_Multiple_Users_Same_Number(t *testing.T) {
+	a := newTestManager(t, PermissionDenyAll)
+
+	require.Nil(t, a.AddUser("phil", "phil", RoleUser))
+	require.Nil(t, a.AddUser("ben", "ben", RoleUser))
+	phil, err := a.User("phil")
+	require.Nil(t, err)
+	ben, err := a.User("ben")
+	require.Nil(t, err)
+	require.Nil(t, a.AddPhoneNumber(phil.ID, "+1234567890"))
+	require.Nil(t, a.AddPhoneNumber(ben.ID, "+1234567890"))
+}
+
 func TestSqliteCache_Migration_From1(t *testing.T) {
 	filename := filepath.Join(t.TempDir(), "user.db")
 	db, err := sql.Open("sqlite3", filename)
--- a/user/types.go
+++ b/user/types.go
@ -86,6 +86,7 @@ type Tier struct {
 	MessageLimit             int64         // Daily message limit
 	MessageExpiryDuration    time.Duration // Cache duration for messages
 	EmailLimit               int64         // Daily email limit
+	CallLimit                int64         // Daily phone call limit
 	ReservationLimit         int64         // Number of topic reservations allowed by user
 	AttachmentFileSizeLimit  int64         // Max file size per file (bytes)
 	AttachmentTotalSizeLimit int64         // Total file size for all files of this user (bytes)
@ -131,6 +132,7 @@ type NotificationPrefs struct {
 type Stats struct {
 	Messages int64
 	Emails   int64
+	Calls    int64
 }

 // Billing is a struct holding a user's billing information
@ -276,7 +278,10 @@ var (
 	ErrUnauthorized        = errors.New("unauthorized")
 	ErrInvalidArgument     = errors.New("invalid argument")
 	ErrUserNotFound        = errors.New("user not found")
+	ErrUserExists          = errors.New("user already exists")
 	ErrTierNotFound        = errors.New("tier not found")
 	ErrTokenNotFound       = errors.New("token not found")
+	ErrPhoneNumberNotFound = errors.New("phone number not found")
 	ErrTooManyReservations = errors.New("new tier has lower reservation limit")
+	ErrPhoneNumberExists   = errors.New("phone number already exists")
 )
--- a/web/package-lock.json
+++ b/web/package-lock.json
@ -3134,14 +3134,14 @@
      "integrity": "sha512-Hcv+nVC0kZnQ3tD9GVu5xSMR4VVYOteQIr/hwFPVEvPdlXqgGEuRjiheChHgdM+JyqdgNcmzZOX/tnl0JOiI7A=="
    },
    "node_modules/@mui/base": {
-      "version": "5.0.0-beta.0",
-      "resolved": "https://registry.npmjs.org/@mui/base/-/base-5.0.0-beta.0.tgz",
-      "integrity": "sha512-ap+juKvt8R8n3cBqd/pGtZydQ4v2I/hgJKnvJRGjpSh3RvsvnDHO4rXov8MHQlH6VqpOekwgilFLGxMZjNTucA==",
+      "version": "5.0.0-beta.1",
+      "resolved": "https://registry.npmjs.org/@mui/base/-/base-5.0.0-beta.1.tgz",
+      "integrity": "sha512-xrkDCeu3JQE+JjJUnJnOrdQJMXwKhbV4AW+FRjMIj5i9cHK3BAuatG/iqbf1M+jklVWLk0KdbgioKwK+03aYbA==",
      "dependencies": {
        "@babel/runtime": "^7.21.0",
        "@emotion/is-prop-valid": "^1.2.0",
        "@mui/types": "^7.2.4",
-        "@mui/utils": "^5.12.3",
+        "@mui/utils": "^5.13.1",
        "@popperjs/core": "^2.11.7",
        "clsx": "^1.2.1",
        "prop-types": "^15.8.1",
@ -3166,9 +3166,9 @@
      }
    },
    "node_modules/@mui/core-downloads-tracker": {
-      "version": "5.13.0",
-      "resolved": "https://registry.npmjs.org/@mui/core-downloads-tracker/-/core-downloads-tracker-5.13.0.tgz",
-      "integrity": "sha512-5nXz2k8Rv2ZjtQY6kXirJVyn2+ODaQuAJmXSJtLDUQDKWp3PFUj6j3bILqR0JGOs9R5ejgwz3crLKsl6GwjwkQ==",
+      "version": "5.13.1",
+      "resolved": "https://registry.npmjs.org/@mui/core-downloads-tracker/-/core-downloads-tracker-5.13.1.tgz",
+      "integrity": "sha512-qDHtNDO72NcBQMhaWBt9EZMvNiO+OXjPg5Sdk/6LgRDw6Zr3HdEZ5n2FJ/qtYsaT/okGyCuQavQkcZCOCEVf/g==",
      "funding": {
        "type": "opencollective",
        "url": "https://opencollective.com/mui"
@ -3200,16 +3200,16 @@
      }
    },
    "node_modules/@mui/material": {
-      "version": "5.13.0",
-      "resolved": "https://registry.npmjs.org/@mui/material/-/material-5.13.0.tgz",
-      "integrity": "sha512-ckS+9tCpAzpdJdaTF+btF0b6mF9wbXg/EVKtnoAWYi0UKXoXBAVvEUMNpLGA5xdpCdf+A6fPbVUEHs9TsfU+Yw==",
+      "version": "5.13.1",
+      "resolved": "https://registry.npmjs.org/@mui/material/-/material-5.13.1.tgz",
+      "integrity": "sha512-qSnbJZer8lIuDYFDv19/t3s0AXYY9SxcOdhCnGvetRSfOG4gy3TkiFXNCdW5OLNveTieiMpOuv46eXUmE3ZA6A==",
      "dependencies": {
        "@babel/runtime": "^7.21.0",
-        "@mui/base": "5.0.0-beta.0",
-        "@mui/core-downloads-tracker": "^5.13.0",
-        "@mui/system": "^5.12.3",
+        "@mui/base": "5.0.0-beta.1",
+        "@mui/core-downloads-tracker": "^5.13.1",
+        "@mui/system": "^5.13.1",
        "@mui/types": "^7.2.4",
-        "@mui/utils": "^5.12.3",
+        "@mui/utils": "^5.13.1",
        "@types/react-transition-group": "^4.4.6",
        "clsx": "^1.2.1",
        "csstype": "^3.1.2",
@ -3244,12 +3244,12 @@
      }
    },
    "node_modules/@mui/private-theming": {
-      "version": "5.12.3",
-      "resolved": "https://registry.npmjs.org/@mui/private-theming/-/private-theming-5.12.3.tgz",
-      "integrity": "sha512-o1e7Z1Bp27n4x2iUHhegV4/Jp6H3T6iBKHJdLivS5GbwsuAE/5l4SnZ+7+K+e5u9TuhwcAKZLkjvqzkDe8zqfA==",
+      "version": "5.13.1",
+      "resolved": "https://registry.npmjs.org/@mui/private-theming/-/private-theming-5.13.1.tgz",
+      "integrity": "sha512-HW4npLUD9BAkVppOUZHeO1FOKUJWAwbpy0VQoGe3McUYTlck1HezGHQCfBQ5S/Nszi7EViqiimECVl9xi+/WjQ==",
      "dependencies": {
        "@babel/runtime": "^7.21.0",
-        "@mui/utils": "^5.12.3",
+        "@mui/utils": "^5.13.1",
        "prop-types": "^15.8.1"
      },
      "engines": {
@ -3301,15 +3301,15 @@
      }
    },
    "node_modules/@mui/system": {
-      "version": "5.12.3",
-      "resolved": "https://registry.npmjs.org/@mui/system/-/system-5.12.3.tgz",
-      "integrity": "sha512-JB/6sypHqeJCqwldWeQ1MKkijH829EcZAKKizxbU2MJdxGG5KSwZvTBa5D9qiJUA1hJFYYupjiuy9ZdJt6rV6w==",
+      "version": "5.13.1",
+      "resolved": "https://registry.npmjs.org/@mui/system/-/system-5.13.1.tgz",
+      "integrity": "sha512-BsDUjhiO6ZVAvzKhnWBHLZ5AtPJcdT+62VjnRLyA4isboqDKLg4fmYIZXq51yndg/soDK9RkY5lYZwEDku13Ow==",
      "dependencies": {
        "@babel/runtime": "^7.21.0",
-        "@mui/private-theming": "^5.12.3",
+        "@mui/private-theming": "^5.13.1",
        "@mui/styled-engine": "^5.12.3",
        "@mui/types": "^7.2.4",
-        "@mui/utils": "^5.12.3",
+        "@mui/utils": "^5.13.1",
        "clsx": "^1.2.1",
        "csstype": "^3.1.2",
        "prop-types": "^15.8.1"
@ -3353,13 +3353,13 @@
      }
    },
    "node_modules/@mui/utils": {
-      "version": "5.12.3",
-      "resolved": "https://registry.npmjs.org/@mui/utils/-/utils-5.12.3.tgz",
-      "integrity": "sha512-D/Z4Ub3MRl7HiUccid7sQYclTr24TqUAQFFlxHQF8FR177BrCTQ0JJZom7EqYjZCdXhwnSkOj2ph685MSKNtIA==",
+      "version": "5.13.1",
+      "resolved": "https://registry.npmjs.org/@mui/utils/-/utils-5.13.1.tgz",
+      "integrity": "sha512-6lXdWwmlUbEU2jUI8blw38Kt+3ly7xkmV9ljzY4Q20WhsJMWiNry9CX8M+TaP/HbtuyR8XKsdMgQW7h7MM3n3A==",
      "dependencies": {
        "@babel/runtime": "^7.21.0",
        "@types/prop-types": "^15.7.5",
-        "@types/react-is": "^16.7.1 || ^17.0.0",
+        "@types/react-is": "^18.2.0",
        "prop-types": "^15.8.1",
        "react-is": "^18.2.0"
      },
@ -4016,9 +4016,9 @@
      "integrity": "sha512-YATxVxgRqNH6nHEIsvg6k2Boc1JHI9ZbH5iWFFv/MTkchz3b1ieGDa5T0a9RznNdI0KhVbdbWSN+KWWrQZRxTw=="
    },
    "node_modules/@types/node": {
-      "version": "20.1.4",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-20.1.4.tgz",
-      "integrity": "sha512-At4pvmIOki8yuwLtd7BNHl3CiWNbtclUbNtScGx4OHfBd4/oWoJC8KRCIxXwkdndzhxOsPXihrsOoydxBjlE9Q=="
+      "version": "20.1.7",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-20.1.7.tgz",
+      "integrity": "sha512-WCuw/o4GSwDGMoonES8rcvwsig77dGCMbZDrZr2x4ZZiNW4P/gcoZXe/0twgtobcTkmg9TuKflxYL/DuwDyJzg=="
    },
    "node_modules/@types/parse-json": {
      "version": "4.0.0",
@ -4061,21 +4061,11 @@
      }
    },
    "node_modules/@types/react-is": {
-      "version": "17.0.4",
-      "resolved": "https://registry.npmjs.org/@types/react-is/-/react-is-17.0.4.tgz",
-      "integrity": "sha512-FLzd0K9pnaEvKz4D1vYxK9JmgQPiGk1lu23o1kqGsLeT0iPbRSF7b76+S5T9fD8aRa0B8bY7I/3DebEj+1ysBA==",
+      "version": "18.2.0",
+      "resolved": "https://registry.npmjs.org/@types/react-is/-/react-is-18.2.0.tgz",
+      "integrity": "sha512-1vz2yObaQkLL7YFe/pme2cpvDsCwI1WXIfL+5eLz0MI9gFG24Re16RzUsI8t9XZn9ZWvgLNDrJBmrqXJO7GNQQ==",
      "dependencies": {
-        "@types/react": "^17"
-      }
-    },
-    "node_modules/@types/react-is/node_modules/@types/react": {
-      "version": "17.0.59",
-      "resolved": "https://registry.npmjs.org/@types/react/-/react-17.0.59.tgz",
-      "integrity": "sha512-gSON5zWYIGyoBcycCE75E9+r6dCC2dHdsrVkOEiIYNU5+Q28HcBAuqvDuxHcCbMfHBHdeT5Tva/AFn3rnMKE4g==",
-      "dependencies": {
-        "@types/prop-types": "*",
-        "@types/scheduler": "*",
-        "csstype": "^3.0.2"
+        "@types/react": "*"
      }
    },
    "node_modules/@types/react-transition-group": {
@ -4175,14 +4165,14 @@
      "integrity": "sha512-iO9ZQHkZxHn4mSakYV0vFHAVDyEOIJQrV2uZ06HxEPcx+mt8swXoZHIbaaJ2crJYFfErySgktuTZ3BeLz+XmFA=="
    },
    "node_modules/@typescript-eslint/eslint-plugin": {
-      "version": "5.59.5",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-5.59.5.tgz",
-      "integrity": "sha512-feA9xbVRWJZor+AnLNAr7A8JRWeZqHUf4T9tlP+TN04b05pFVhO5eN7/O93Y/1OUlLMHKbnJisgDURs/qvtqdg==",
+      "version": "5.59.6",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-5.59.6.tgz",
+      "integrity": "sha512-sXtOgJNEuRU5RLwPUb1jxtToZbgvq3M6FPpY4QENxoOggK+UpTxUBpj6tD8+Qh2g46Pi9We87E+eHnUw8YcGsw==",
      "dependencies": {
        "@eslint-community/regexpp": "^4.4.0",
-        "@typescript-eslint/scope-manager": "5.59.5",
-        "@typescript-eslint/type-utils": "5.59.5",
-        "@typescript-eslint/utils": "5.59.5",
+        "@typescript-eslint/scope-manager": "5.59.6",
+        "@typescript-eslint/type-utils": "5.59.6",
+        "@typescript-eslint/utils": "5.59.6",
        "debug": "^4.3.4",
        "grapheme-splitter": "^1.0.4",
        "ignore": "^5.2.0",
@ -4208,11 +4198,11 @@
      }
    },
    "node_modules/@typescript-eslint/experimental-utils": {
-      "version": "5.59.5",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/experimental-utils/-/experimental-utils-5.59.5.tgz",
-      "integrity": "sha512-ArcSSBifznsKNA/p4h2w3Olt/T8AZf3bNglxD8OnuTsSDJbRpjPPmI8qpr6ijyvk1J/T3GMJHwRIluS/Kuz9kA==",
+      "version": "5.59.6",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/experimental-utils/-/experimental-utils-5.59.6.tgz",
+      "integrity": "sha512-UIVfEaaHggOuhgqdpFlFQ7IN9UFMCiBR/N7uPBUyUlwNdJzYfAu9m4wbOj0b59oI/HSPW1N63Q7lsvfwTQY13w==",
      "dependencies": {
-        "@typescript-eslint/utils": "5.59.5"
+        "@typescript-eslint/utils": "5.59.6"
      },
      "engines": {
        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
@ -4226,13 +4216,13 @@
      }
    },
    "node_modules/@typescript-eslint/parser": {
-      "version": "5.59.5",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-5.59.5.tgz",
-      "integrity": "sha512-NJXQC4MRnF9N9yWqQE2/KLRSOLvrrlZb48NGVfBa+RuPMN6B7ZcK5jZOvhuygv4D64fRKnZI4L4p8+M+rfeQuw==",
+      "version": "5.59.6",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-5.59.6.tgz",
+      "integrity": "sha512-7pCa6al03Pv1yf/dUg/s1pXz/yGMUBAw5EeWqNTFiSueKvRNonze3hma3lhdsOrQcaOXhbk5gKu2Fludiho9VA==",
      "dependencies": {
-        "@typescript-eslint/scope-manager": "5.59.5",
-        "@typescript-eslint/types": "5.59.5",
-        "@typescript-eslint/typescript-estree": "5.59.5",
+        "@typescript-eslint/scope-manager": "5.59.6",
+        "@typescript-eslint/types": "5.59.6",
+        "@typescript-eslint/typescript-estree": "5.59.6",
        "debug": "^4.3.4"
      },
      "engines": {
@ -4252,12 +4242,12 @@
      }
    },
    "node_modules/@typescript-eslint/scope-manager": {
-      "version": "5.59.5",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/scope-manager/-/scope-manager-5.59.5.tgz",
-      "integrity": "sha512-jVecWwnkX6ZgutF+DovbBJirZcAxgxC0EOHYt/niMROf8p4PwxxG32Qdhj/iIQQIuOflLjNkxoXyArkcIP7C3A==",
+      "version": "5.59.6",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/scope-manager/-/scope-manager-5.59.6.tgz",
+      "integrity": "sha512-gLbY3Le9Dxcb8KdpF0+SJr6EQ+hFGYFl6tVY8VxLPFDfUZC7BHFw+Vq7bM5lE9DwWPfx4vMWWTLGXgpc0mAYyQ==",
      "dependencies": {
-        "@typescript-eslint/types": "5.59.5",
-        "@typescript-eslint/visitor-keys": "5.59.5"
+        "@typescript-eslint/types": "5.59.6",
+        "@typescript-eslint/visitor-keys": "5.59.6"
      },
      "engines": {
        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
@ -4268,12 +4258,12 @@
      }
    },
    "node_modules/@typescript-eslint/type-utils": {
-      "version": "5.59.5",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/type-utils/-/type-utils-5.59.5.tgz",
-      "integrity": "sha512-4eyhS7oGym67/pSxA2mmNq7X164oqDYNnZCUayBwJZIRVvKpBCMBzFnFxjeoDeShjtO6RQBHBuwybuX3POnDqg==",
+      "version": "5.59.6",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/type-utils/-/type-utils-5.59.6.tgz",
+      "integrity": "sha512-A4tms2Mp5yNvLDlySF+kAThV9VTBPCvGf0Rp8nl/eoDX9Okun8byTKoj3fJ52IJitjWOk0fKPNQhXEB++eNozQ==",
      "dependencies": {
-        "@typescript-eslint/typescript-estree": "5.59.5",
-        "@typescript-eslint/utils": "5.59.5",
+        "@typescript-eslint/typescript-estree": "5.59.6",
+        "@typescript-eslint/utils": "5.59.6",
        "debug": "^4.3.4",
        "tsutils": "^3.21.0"
      },
@ -4294,9 +4284,9 @@
      }
    },
    "node_modules/@typescript-eslint/types": {
-      "version": "5.59.5",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-5.59.5.tgz",
-      "integrity": "sha512-xkfRPHbqSH4Ggx4eHRIO/eGL8XL4Ysb4woL8c87YuAo8Md7AUjyWKa9YMwTL519SyDPrfEgKdewjkxNCVeJW7w==",
+      "version": "5.59.6",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-5.59.6.tgz",
+      "integrity": "sha512-tH5lBXZI7T2MOUgOWFdVNUILsI02shyQvfzG9EJkoONWugCG77NDDa1EeDGw7oJ5IvsTAAGVV8I3Tk2PNu9QfA==",
      "engines": {
        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
      },
@ -4306,12 +4296,12 @@
      }
    },
    "node_modules/@typescript-eslint/typescript-estree": {
-      "version": "5.59.5",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-5.59.5.tgz",
-      "integrity": "sha512-+XXdLN2CZLZcD/mO7mQtJMvCkzRfmODbeSKuMY/yXbGkzvA9rJyDY5qDYNoiz2kP/dmyAxXquL2BvLQLJFPQIg==",
+      "version": "5.59.6",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-5.59.6.tgz",
+      "integrity": "sha512-vW6JP3lMAs/Tq4KjdI/RiHaaJSO7IUsbkz17it/Rl9Q+WkQ77EOuOnlbaU8kKfVIOJxMhnRiBG+olE7f3M16DA==",
      "dependencies": {
-        "@typescript-eslint/types": "5.59.5",
-        "@typescript-eslint/visitor-keys": "5.59.5",
+        "@typescript-eslint/types": "5.59.6",
+        "@typescript-eslint/visitor-keys": "5.59.6",
        "debug": "^4.3.4",
        "globby": "^11.1.0",
        "is-glob": "^4.0.3",
@ -4332,16 +4322,16 @@
      }
    },
    "node_modules/@typescript-eslint/utils": {
-      "version": "5.59.5",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/utils/-/utils-5.59.5.tgz",
-      "integrity": "sha512-sCEHOiw+RbyTii9c3/qN74hYDPNORb8yWCoPLmB7BIflhplJ65u2PBpdRla12e3SSTJ2erRkPjz7ngLHhUegxA==",
+      "version": "5.59.6",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/utils/-/utils-5.59.6.tgz",
+      "integrity": "sha512-vzaaD6EXbTS29cVH0JjXBdzMt6VBlv+hE31XktDRMX1j3462wZCJa7VzO2AxXEXcIl8GQqZPcOPuW/Z1tZVogg==",
      "dependencies": {
        "@eslint-community/eslint-utils": "^4.2.0",
        "@types/json-schema": "^7.0.9",
        "@types/semver": "^7.3.12",
-        "@typescript-eslint/scope-manager": "5.59.5",
-        "@typescript-eslint/types": "5.59.5",
-        "@typescript-eslint/typescript-estree": "5.59.5",
+        "@typescript-eslint/scope-manager": "5.59.6",
+        "@typescript-eslint/types": "5.59.6",
+        "@typescript-eslint/typescript-estree": "5.59.6",
        "eslint-scope": "^5.1.1",
        "semver": "^7.3.7"
      },
@ -4377,11 +4367,11 @@
      }
    },
    "node_modules/@typescript-eslint/visitor-keys": {
-      "version": "5.59.5",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-5.59.5.tgz",
-      "integrity": "sha512-qL+Oz+dbeBRTeyJTIy0eniD3uvqU7x+y1QceBismZ41hd4aBSRh8UAw4pZP0+XzLuPZmx4raNMq/I+59W2lXKA==",
+      "version": "5.59.6",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-5.59.6.tgz",
+      "integrity": "sha512-zEfbFLzB9ETcEJ4HZEEsCR9HHeNku5/Qw1jSS5McYJv5BR+ftYXwFFAH5Al+xkGaZEqowMwl7uoJjQb1YSPF8Q==",
      "dependencies": {
-        "@typescript-eslint/types": "5.59.5",
+        "@typescript-eslint/types": "5.59.6",
        "eslint-visitor-keys": "^3.3.0"
      },
      "engines": {
@ -4956,9 +4946,9 @@
      }
    },
    "node_modules/axe-core": {
-      "version": "4.7.0",
-      "resolved": "https://registry.npmjs.org/axe-core/-/axe-core-4.7.0.tgz",
-      "integrity": "sha512-M0JtH+hlOL5pLQwHOLNYZaXuhqmvS8oExsqB1SBYgA4Dk7u/xx+YdGHXaK5pyUfed5mYXdlYiphWq3G8cRi5JQ==",
+      "version": "4.7.1",
+      "resolved": "https://registry.npmjs.org/axe-core/-/axe-core-4.7.1.tgz",
+      "integrity": "sha512-sCXXUhA+cljomZ3ZAwb8i1p3oOlkABzPy08ZDAoGcYuvtBPlQ1Ytde129ArXyHWDhfeewq7rlx9F+cUx2SSlkg==",
      "engines": {
        "node": ">=4"
      }
@ -5511,9 +5501,9 @@
      }
    },
    "node_modules/caniuse-lite": {
-      "version": "1.0.30001487",
-      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001487.tgz",
-      "integrity": "sha512-83564Z3yWGqXsh2vaH/mhXfEM0wX+NlBCm1jYHOb97TrTWJEmPTccZgeLTPBUUb0PNVo+oomb7wkimZBIERClA==",
+      "version": "1.0.30001488",
+      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001488.tgz",
+      "integrity": "sha512-NORIQuuL4xGpIy6iCCQGN4iFjlBXtfKWIenlUuyZJumLRIindLb7wXM+GO8erEhb7vXfcnf4BAg2PrSDN5TNLQ==",
      "funding": [
        {
          "type": "opencollective",
@ -6749,9 +6739,9 @@
      }
    },
    "node_modules/electron-to-chromium": {
-      "version": "1.4.394",
-      "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.4.394.tgz",
-      "integrity": "sha512-0IbC2cfr8w5LxTz+nmn2cJTGafsK9iauV2r5A5scfzyovqLrxuLoxOHE5OBobP3oVIggJT+0JfKnw9sm87c8Hw=="
+      "version": "1.4.397",
+      "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.4.397.tgz",
+      "integrity": "sha512-jwnPxhh350Q/aMatQia31KAIQdhEsYS0fFZ0BQQlN9tfvOEwShu6ZNwI4kL/xBabjcB/nTy6lSt17kNIluJZ8Q=="
    },
    "node_modules/emittery": {
      "version": "0.8.1",
@ -9146,9 +9136,9 @@
      }
    },
    "node_modules/is-core-module": {
-      "version": "2.12.0",
-      "resolved": "https://registry.npmjs.org/is-core-module/-/is-core-module-2.12.0.tgz",
-      "integrity": "sha512-RECHCBCd/viahWmwj6enj19sKbHfJrddi/6cBDsNTKbNq0f7VeaUkBo60BqzvPqo/W54ChS62Z5qyun7cfOMqQ==",
+      "version": "2.12.1",
+      "resolved": "https://registry.npmjs.org/is-core-module/-/is-core-module-2.12.1.tgz",
+      "integrity": "sha512-Q4ZuBAe2FUsKtyQJoQHlvP8OvBERxO3jEmy1I7hcRXcJBGGHFh/aJBswbXuS9sgrDH2QUO8ilkwNPHvHMd8clg==",
      "dependencies": {
        "has": "^1.0.3"
      },
@ -13879,9 +13869,9 @@
      }
    },
    "node_modules/postcss-selector-parser": {
-      "version": "6.0.12",
-      "resolved": "https://registry.npmjs.org/postcss-selector-parser/-/postcss-selector-parser-6.0.12.tgz",
-      "integrity": "sha512-NdxGCAZdRrwVI1sy59+Wzrh+pMMHxapGnpfenDVlMEXoOcvt4pGE0JLK9YY2F5dLxcFYA/YbVQKhcGU+FtSYQg==",
+      "version": "6.0.13",
+      "resolved": "https://registry.npmjs.org/postcss-selector-parser/-/postcss-selector-parser-6.0.13.tgz",
+      "integrity": "sha512-EaV1Gl4mUEV4ddhDnv/xtj7sxwrwxdetHdWUGnT4VJQf+4d05v6lHYZr8N573k5Z0BViss7BDhfWtKS3+sfAqQ==",
      "dependencies": {
        "cssesc": "^3.0.0",
        "util-deprecate": "^1.0.2"
@ -15976,9 +15966,9 @@
      }
    },
    "node_modules/terser": {
-      "version": "5.17.3",
-      "resolved": "https://registry.npmjs.org/terser/-/terser-5.17.3.tgz",
-      "integrity": "sha512-AudpAZKmZHkG9jueayypz4duuCFJMMNGRMwaPvQKWfxKedh8Z2x3OCoDqIIi1xx5+iwx1u6Au8XQcc9Lke65Yg==",
+      "version": "5.17.4",
+      "resolved": "https://registry.npmjs.org/terser/-/terser-5.17.4.tgz",
+      "integrity": "sha512-jcEKZw6UPrgugz/0Tuk/PVyLAPfMBJf5clnGueo45wTweoV8yh7Q7PEkhkJ5uuUbC7zAxEcG3tqNr1bstkQ8nw==",
      "dependencies": {
        "@jridgewell/source-map": "^0.3.2",
        "acorn": "^8.5.0",
@ -16272,16 +16262,16 @@
      }
    },
    "node_modules/typescript": {
-      "version": "5.0.4",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.0.4.tgz",
-      "integrity": "sha512-cW9T5W9xY37cc+jfEnaUvX91foxtHkza3Nw3wkoF4sSlKn0MONdkdEndig/qPBWXNkmplh3NzayQzCiHM4/hqw==",
+      "version": "4.9.5",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.9.5.tgz",
+      "integrity": "sha512-1FXk9E2Hm+QzZQ7z+McJiHL4NW1F2EzMu9Nq9i3zAaGqibafqYwCVU6WyWAuyQRRzOlxou8xZSyXLEN8oKj24g==",
      "peer": true,
      "bin": {
        "tsc": "bin/tsc",
        "tsserver": "bin/tsserver"
      },
      "engines": {
-        "node": ">=12.20"
+        "node": ">=4.2.0"
      }
    },
    "node_modules/unbox-primitive": {
--- a/web/public/config.js
+++ b/web/public/config.js
@ -12,6 +12,8 @@ var config = {
    enable_signup: true,
    enable_payments: true,
    enable_reservations: true,
+    enable_emails: true,
+    enable_calls: true,
    billing_contact: "",
    disallowed_topics: ["docs", "static", "file", "app", "account", "settings", "signup", "login", "v1"]
 };
--- a/web/public/static/langs/ar.json
+++ b/web/public/static/langs/ar.json
@ -152,7 +152,7 @@
    "publish_dialog_chip_delay_label": "تأخير التسليم",
    "subscribe_dialog_login_description": "هذا الموضوع محمي بكلمة مرور. الرجاء إدخال اسم المستخدم وكلمة المرور للاشتراك.",
    "subscribe_dialog_subscribe_button_cancel": "إلغاء",
-    "subscribe_dialog_login_button_back": "العودة",
+    "common_back": "العودة",
    "prefs_notifications_sound_play": "تشغيل الصوت المحدد",
    "prefs_notifications_min_priority_title": "أولوية دنيا",
    "prefs_notifications_min_priority_max_only": "الأولوية القصوى فقط",
@ -225,7 +225,7 @@
    "account_tokens_table_expires_header": "تنتهي مدة صلاحيته في",
    "account_tokens_table_never_expires": "لا تنتهي صلاحيتها أبدا",
    "account_tokens_table_current_session": "جلسة المتصفح الحالية",
-    "account_tokens_table_copy_to_clipboard": "انسخ إلى الحافظة",
+    "common_copy_to_clipboard": "انسخ إلى الحافظة",
    "account_tokens_table_cannot_delete_or_edit": "لا يمكن تحرير أو حذف الرمز المميز للجلسة الحالية",
    "account_tokens_table_create_token_button": "إنشاء رمز مميز للوصول",
    "account_tokens_table_last_origin_tooltip": "من عنوان IP {{ip}}، انقر للبحث",
--- a/web/public/static/langs/bg.json
+++ b/web/public/static/langs/bg.json
@ -104,7 +104,7 @@
    "subscribe_dialog_subscribe_topic_placeholder": "Име на темата, напр. phils_alerts",
    "subscribe_dialog_subscribe_use_another_label": "Използване на друг сървър",
    "subscribe_dialog_login_username_label": "Потребител, напр. phil",
-    "subscribe_dialog_login_button_back": "Назад",
+    "common_back": "Назад",
    "subscribe_dialog_subscribe_button_cancel": "Отказ",
    "subscribe_dialog_login_description": "Темата е защитена. За да се абонирате въведете потребител и парола.",
    "subscribe_dialog_subscribe_button_subscribe": "Абониране",
--- a/web/public/static/langs/cs.json
+++ b/web/public/static/langs/cs.json
@ -91,7 +91,7 @@
    "subscribe_dialog_subscribe_button_subscribe": "Přihlásit odběr",
    "subscribe_dialog_login_username_label": "Uživatelské jméno, např. phil",
    "subscribe_dialog_login_password_label": "Heslo",
-    "subscribe_dialog_login_button_back": "Zpět",
+    "common_back": "Zpět",
    "subscribe_dialog_login_button_login": "Přihlásit se",
    "subscribe_dialog_error_user_not_authorized": "Uživatel {{username}} není autorizován",
    "subscribe_dialog_error_user_anonymous": "anonymně",
@ -305,7 +305,7 @@
    "account_tokens_table_expires_header": "Vyprší",
    "account_tokens_table_never_expires": "Nikdy nevyprší",
    "account_tokens_table_current_session": "Současná relace prohlížeče",
-    "account_tokens_table_copy_to_clipboard": "Kopírování do schránky",
+    "common_copy_to_clipboard": "Kopírování do schránky",
    "account_tokens_table_label_header": "Popisek",
    "account_tokens_table_cannot_delete_or_edit": "Nelze upravit nebo odstranit aktuální token relace",
    "account_tokens_table_create_token_button": "Vytvořit přístupový token",
--- a/web/public/static/langs/da.json
+++ b/web/public/static/langs/da.json
@ -91,7 +91,7 @@
    "publish_dialog_delay_label": "Forsinkelse",
    "publish_dialog_button_send": "Send",
    "subscribe_dialog_subscribe_button_subscribe": "Tilmeld",
-    "subscribe_dialog_login_button_back": "Tilbage",
+    "common_back": "Tilbage",
    "subscribe_dialog_login_username_label": "Brugernavn, f.eks. phil",
    "account_basics_title": "Konto",
    "subscribe_dialog_error_topic_already_reserved": "Emnet er allerede reserveret",
@ -209,7 +209,7 @@
    "subscribe_dialog_subscribe_use_another_label": "Brug en anden server",
    "account_basics_tier_upgrade_button": "Opgrader til Pro",
    "account_upgrade_dialog_tier_features_messages_other": "{{messages}} daglige beskeder",
-    "account_tokens_table_copy_to_clipboard": "Kopier til udklipsholder",
+    "common_copy_to_clipboard": "Kopier til udklipsholder",
    "prefs_reservations_edit_button": "Rediger emneadgang",
    "account_upgrade_dialog_title": "Skift kontoniveau",
    "account_upgrade_dialog_tier_features_reservations_other": "{{reservations}} reserverede emner",
--- a/web/public/static/langs/de.json
+++ b/web/public/static/langs/de.json
@ -94,7 +94,7 @@
    "publish_dialog_delay_placeholder": "Auslieferung verzögern, z.B. {{unixTimestamp}}, {{relativeTime}}, oder \"{{naturalLanguage}}\" (nur Englisch)",
    "prefs_appearance_title": "Darstellung",
    "subscribe_dialog_login_password_label": "Kennwort",
-    "subscribe_dialog_login_button_back": "Zurück",
+    "common_back": "Zurück",
    "publish_dialog_chip_attach_url_label": "Datei von URL anhängen",
    "publish_dialog_chip_delay_label": "Auslieferung verzögern",
    "publish_dialog_chip_topic_label": "Thema ändern",
@ -284,7 +284,7 @@
    "account_tokens_table_expires_header": "Verfällt",
    "account_tokens_table_never_expires": "Verfällt nie",
    "account_tokens_table_current_session": "Aktuelle Browser-Sitzung",
-    "account_tokens_table_copy_to_clipboard": "In die Zwischenablage kopieren",
+    "common_copy_to_clipboard": "In die Zwischenablage kopieren",
    "account_tokens_table_copied_to_clipboard": "Access-Token kopiert",
    "account_tokens_table_cannot_delete_or_edit": "Aktuelles Token kann nicht bearbeitet oder gelöscht werden",
    "account_tokens_table_create_token_button": "Access-Token erzeugen",
--- a/web/public/static/langs/en.json
+++ b/web/public/static/langs/en.json
@ -2,6 +2,8 @@
  "common_cancel": "Cancel",
  "common_save": "Save",
  "common_add": "Add",
+  "common_back": "Back",
+  "common_copy_to_clipboard": "Copy to clipboard",
  "signup_title": "Create a ntfy account",
  "signup_form_username": "Username",
  "signup_form_password": "Password",
@ -127,6 +129,9 @@
  "publish_dialog_email_label": "Email",
  "publish_dialog_email_placeholder": "Address to forward the notification to, e.g. phil@example.com",
  "publish_dialog_email_reset": "Remove email forward",
+  "publish_dialog_call_label": "Phone call",
+  "publish_dialog_call_placeholder": "Phone number to call with the message, e.g. +12223334444, or 'yes'",
+  "publish_dialog_call_reset": "Remove phone call",
  "publish_dialog_attach_label": "Attachment URL",
  "publish_dialog_attach_placeholder": "Attach file by URL, e.g. https://f-droid.org/F-Droid.apk",
  "publish_dialog_attach_reset": "Remove attachment URL",
@ -138,6 +143,7 @@
  "publish_dialog_other_features": "Other features:",
  "publish_dialog_chip_click_label": "Click URL",
  "publish_dialog_chip_email_label": "Forward to email",
+  "publish_dialog_chip_call_label": "Phone call",
  "publish_dialog_chip_attach_url_label": "Attach file by URL",
  "publish_dialog_chip_attach_file_label": "Attach local file",
  "publish_dialog_chip_delay_label": "Delay delivery",
@ -165,7 +171,6 @@
  "subscribe_dialog_login_description": "This topic is password-protected. Please enter username and password to subscribe.",
  "subscribe_dialog_login_username_label": "Username, e.g. phil",
  "subscribe_dialog_login_password_label": "Password",
-  "subscribe_dialog_login_button_back": "Back",
  "subscribe_dialog_login_button_login": "Login",
  "subscribe_dialog_error_user_not_authorized": "User {{username}} not authorized",
  "subscribe_dialog_error_topic_already_reserved": "Topic already reserved",
@ -182,6 +187,21 @@
  "account_basics_password_dialog_confirm_password_label": "Confirm password",
  "account_basics_password_dialog_button_submit": "Change password",
  "account_basics_password_dialog_current_password_incorrect": "Password incorrect",
+  "account_basics_phone_numbers_title": "Phone numbers",
+  "account_basics_phone_numbers_dialog_description": "To use the call notification feature, you need to add and verify at least one phone number. Verification can be done via SMS or a phone call.",
+  "account_basics_phone_numbers_description": "For phone call notifications",
+  "account_basics_phone_numbers_no_phone_numbers_yet": "No phone numbers yet",
+  "account_basics_phone_numbers_copied_to_clipboard": "Phone number copied to clipboard",
+  "account_basics_phone_numbers_dialog_title": "Add phone number",
+  "account_basics_phone_numbers_dialog_number_label": "Phone number",
+  "account_basics_phone_numbers_dialog_number_placeholder": "e.g. +1222333444",
+  "account_basics_phone_numbers_dialog_verify_button_sms": "Send SMS",
+  "account_basics_phone_numbers_dialog_verify_button_call": "Call me",
+  "account_basics_phone_numbers_dialog_code_label": "Verification code",
+  "account_basics_phone_numbers_dialog_code_placeholder": "e.g. 123456",
+  "account_basics_phone_numbers_dialog_check_verification_button": "Confirm code",
+  "account_basics_phone_numbers_dialog_channel_sms": "SMS",
+  "account_basics_phone_numbers_dialog_channel_call": "Call",
  "account_usage_title": "Usage",
  "account_usage_of_limit": "of {{limit}}",
  "account_usage_unlimited": "Unlimited",
@ -203,6 +223,8 @@
  "account_basics_tier_manage_billing_button": "Manage billing",
  "account_usage_messages_title": "Published messages",
  "account_usage_emails_title": "Emails sent",
+  "account_usage_calls_title": "Phone calls made",
+  "account_usage_calls_none": "No phone calls can be made with this account",
  "account_usage_reservations_title": "Reserved topics",
  "account_usage_reservations_none": "No reserved topics for this account",
  "account_usage_attachment_storage_title": "Attachment storage",
@ -232,6 +254,9 @@
  "account_upgrade_dialog_tier_features_messages_other": "{{messages}} daily messages",
  "account_upgrade_dialog_tier_features_emails_one": "{{emails}} daily email",
  "account_upgrade_dialog_tier_features_emails_other": "{{emails}} daily emails",
+  "account_upgrade_dialog_tier_features_calls_one": "{{calls}} daily phone calls",
+  "account_upgrade_dialog_tier_features_calls_other": "{{calls}} daily phone calls",
+  "account_upgrade_dialog_tier_features_no_calls": "No phone calls",
  "account_upgrade_dialog_tier_features_attachment_file_size": "{{filesize}} per file",
  "account_upgrade_dialog_tier_features_attachment_total_size": "{{totalsize}} total storage",
  "account_upgrade_dialog_tier_price_per_month": "month",
@ -254,7 +279,6 @@
  "account_tokens_table_expires_header": "Expires",
  "account_tokens_table_never_expires": "Never expires",
  "account_tokens_table_current_session": "Current browser session",
-  "account_tokens_table_copy_to_clipboard": "Copy to clipboard",
  "account_tokens_table_copied_to_clipboard": "Access token copied",
  "account_tokens_table_cannot_delete_or_edit": "Cannot edit or delete current session token",
  "account_tokens_table_create_token_button": "Create access token",
--- a/web/public/static/langs/es.json
+++ b/web/public/static/langs/es.json
@ -81,7 +81,7 @@
    "subscribe_dialog_login_description": "Este tópico está protegido por contraseña. Por favor, introduzca su nombre de usuario y contraseña para suscribirse.",
    "subscribe_dialog_login_username_label": "Nombre de usuario, ej. phil",
    "subscribe_dialog_login_password_label": "Contraseña",
-    "subscribe_dialog_login_button_back": "Volver",
+    "common_back": "Volver",
    "subscribe_dialog_login_button_login": "Iniciar sesión",
    "subscribe_dialog_error_user_not_authorized": "Usuario {{username}} no autorizado",
    "subscribe_dialog_error_user_anonymous": "anónimo",
@ -257,7 +257,7 @@
    "account_tokens_table_expires_header": "Expira",
    "account_tokens_table_never_expires": "Nunca expira",
    "account_tokens_table_current_session": "Sesión del navegador actual",
-    "account_tokens_table_copy_to_clipboard": "Copiar al portapapeles",
+    "common_copy_to_clipboard": "Copiar al portapapeles",
    "account_tokens_table_copied_to_clipboard": "Token de acceso copiado",
    "account_tokens_table_cannot_delete_or_edit": "No se puede editar ni eliminar el token de sesión actual",
    "account_tokens_table_create_token_button": "Crear token de acceso",
--- a/web/public/static/langs/fr.json
+++ b/web/public/static/langs/fr.json
@ -106,7 +106,7 @@
    "prefs_notifications_title": "Notifications",
    "prefs_notifications_delete_after_title": "Supprimer les notifications",
    "prefs_users_add_button": "Ajouter un utilisateur",
-    "subscribe_dialog_login_button_back": "Retour",
+    "common_back": "Retour",
    "subscribe_dialog_error_user_anonymous": "anonyme",
    "prefs_notifications_sound_no_sound": "Aucun son",
    "prefs_notifications_min_priority_title": "Priorité minimum",
@ -293,7 +293,7 @@
    "account_tokens_table_expires_header": "Expire",
    "account_tokens_table_never_expires": "N'expire jamais",
    "account_tokens_table_current_session": "Session de navigation actuelle",
-    "account_tokens_table_copy_to_clipboard": "Copier dans le presse-papier",
+    "common_copy_to_clipboard": "Copier dans le presse-papier",
    "account_tokens_table_copied_to_clipboard": "Jeton d'accès copié",
    "account_tokens_table_create_token_button": "Créer un jeton d'accès",
    "account_tokens_table_last_origin_tooltip": "Depuis l'adresse IP {{ip}}, cliquer pour rechercher",
--- a/web/public/static/langs/hu.json
+++ b/web/public/static/langs/hu.json
@ -84,7 +84,7 @@
    "subscribe_dialog_login_description": "Ez a téma jelszóval védett. Jelentkezz be a feliratkozáshoz.",
    "subscribe_dialog_login_username_label": "Felhasználónév, pl: jozsi",
    "subscribe_dialog_login_password_label": "Jelszó",
-    "subscribe_dialog_login_button_back": "Vissza",
+    "common_back": "Vissza",
    "subscribe_dialog_login_button_login": "Belépés",
    "subscribe_dialog_error_user_anonymous": "névtelen",
    "subscribe_dialog_error_user_not_authorized": "A(z) {{username}} felhasználónak nincs hozzáférése",
--- a/web/public/static/langs/id.json
+++ b/web/public/static/langs/id.json
@ -116,7 +116,7 @@
    "common_save": "Simpan",
    "prefs_appearance_title": "Tampilan",
    "subscribe_dialog_login_password_label": "Kata sandi",
-    "subscribe_dialog_login_button_back": "Kembali",
+    "common_back": "Kembali",
    "prefs_notifications_sound_title": "Suara notifikasi",
    "prefs_notifications_min_priority_low_and_higher": "Prioritas rendah dan lebih tinggi",
    "prefs_notifications_min_priority_default_and_higher": "Prioritas bawaan dan lebih tinggi",
@ -278,7 +278,7 @@
    "account_tokens_table_expires_header": "Kedaluwarsa",
    "account_tokens_table_never_expires": "Tidak pernah kedaluwarsa",
    "account_tokens_table_current_session": "Sesi peramban saat ini",
-    "account_tokens_table_copy_to_clipboard": "Salin ke papan klip",
+    "common_copy_to_clipboard": "Salin ke papan klip",
    "account_tokens_table_copied_to_clipboard": "Token akses disalin",
    "account_tokens_table_cannot_delete_or_edit": "Tidak dapat menyunting atau menghapus token sesi saat ini",
    "account_tokens_table_create_token_button": "Buat token akses",
--- a/web/public/static/langs/it.json
+++ b/web/public/static/langs/it.json
@ -178,7 +178,7 @@
    "prefs_notifications_sound_play": "Riproduci il suono selezionato",
    "prefs_notifications_min_priority_title": "Priorità minima",
    "subscribe_dialog_login_description": "Questo argomento è protetto da password. Per favore inserisci username e password per iscriverti.",
-    "subscribe_dialog_login_button_back": "Indietro",
+    "common_back": "Indietro",
    "subscribe_dialog_error_user_not_authorized": "Utente {{username}} non autorizzato",
    "prefs_notifications_title": "Notifiche",
    "prefs_notifications_delete_after_title": "Elimina le notifiche",
--- a/web/public/static/langs/ja.json
+++ b/web/public/static/langs/ja.json
@ -20,7 +20,7 @@
    "subscribe_dialog_login_description": "このトピックはログインする必要があります。ユーザー名とパスワードを入力してください。",
    "subscribe_dialog_login_username_label": "ユーザー名, 例) phil",
    "subscribe_dialog_login_password_label": "パスワード",
-    "subscribe_dialog_login_button_back": "戻る",
+    "common_back": "戻る",
    "subscribe_dialog_login_button_login": "ログイン",
    "prefs_notifications_min_priority_high_and_higher": "優先度高 およびそれ以上",
    "prefs_notifications_min_priority_max_only": "優先度最高のみ",
@ -258,7 +258,7 @@
    "account_tokens_table_expires_header": "期限",
    "account_tokens_table_never_expires": "無期限",
    "account_tokens_table_current_session": "現在のブラウザセッション",
-    "account_tokens_table_copy_to_clipboard": "クリップボードにコピー",
+    "common_copy_to_clipboard": "クリップボードにコピー",
    "account_tokens_table_copied_to_clipboard": "アクセストークンをコピーしました",
    "account_tokens_table_cannot_delete_or_edit": "現在のセッショントークンは編集または削除できません",
    "account_tokens_table_create_token_button": "アクセストークンを生成",
--- a/web/public/static/langs/ko.json
+++ b/web/public/static/langs/ko.json
@ -93,7 +93,7 @@
    "subscribe_dialog_error_user_not_authorized": "사용자 {{username}} 은(는) 인증되지 않았습니다",
    "subscribe_dialog_login_username_label": "사용자 이름, 예를 들면 phil",
    "subscribe_dialog_login_password_label": "비밀번호",
-    "subscribe_dialog_login_button_back": "뒤로가기",
+    "common_back": "뒤로가기",
    "subscribe_dialog_login_button_login": "로그인",
    "prefs_notifications_title": "알림",
    "prefs_notifications_sound_title": "알림 효과음",
--- a/web/public/static/langs/nb_NO.json
+++ b/web/public/static/langs/nb_NO.json
@ -113,7 +113,7 @@
    "prefs_notifications_delete_after_one_week_description": "Merknader slettes automatisk etter én uke",
    "prefs_notifications_delete_after_one_month_description": "Merknader slettes automatisk etter én måned",
    "priority_min": "min.",
-    "subscribe_dialog_login_button_back": "Tilbake",
+    "common_back": "Tilbake",
    "prefs_notifications_delete_after_three_hours": "Etter tre timer",
    "prefs_users_table_base_url_header": "Tjeneste-nettadresse",
    "common_cancel": "Avbryt",
--- a/web/public/static/langs/nl.json
+++ b/web/public/static/langs/nl.json
@ -140,7 +140,7 @@
    "subscribe_dialog_subscribe_title": "Onderwerp abonneren",
    "subscribe_dialog_subscribe_description": "Onderwerpen zijn mogelijk niet beschermd met een wachtwoord, kies daarom een moeilijk te raden naam. Na abonneren kun je notificaties via PUT/POST sturen.",
    "subscribe_dialog_login_password_label": "Wachtwoord",
-    "subscribe_dialog_login_button_back": "Terug",
+    "common_back": "Terug",
    "subscribe_dialog_login_button_login": "Aanmelden",
    "subscribe_dialog_error_user_not_authorized": "Gebruiker {{username}} heeft geen toegang",
    "subscribe_dialog_error_user_anonymous": "anoniem",
@ -331,7 +331,7 @@
    "account_upgrade_dialog_button_cancel_subscription": "Abonnement opzeggen",
    "account_tokens_table_last_access_header": "Laatste toegang",
    "account_tokens_table_expires_header": "Verloopt op",
-    "account_tokens_table_copy_to_clipboard": "Kopieer naar klembord",
+    "common_copy_to_clipboard": "Kopieer naar klembord",
    "account_tokens_table_copied_to_clipboard": "Toegangstoken gekopieerd",
    "account_tokens_delete_dialog_submit_button": "Token definitief verwijderen",
    "prefs_users_description_no_sync": "Gebruikers en wachtwoorden worden niet gesynchroniseerd met uw account.",
--- a/web/public/static/langs/pl.json
+++ b/web/public/static/langs/pl.json
@ -107,7 +107,7 @@
    "subscribe_dialog_login_username_label": "Nazwa użytkownika, np. phil",
    "subscribe_dialog_login_password_label": "Hasło",
    "publish_dialog_button_cancel": "Anuluj",
-    "subscribe_dialog_login_button_back": "Powrót",
+    "common_back": "Powrót",
    "subscribe_dialog_login_button_login": "Zaloguj się",
    "subscribe_dialog_error_user_not_authorized": "Użytkownik {{username}} nie ma uprawnień",
    "subscribe_dialog_error_user_anonymous": "anonim",
@ -253,7 +253,7 @@
    "account_tokens_table_expires_header": "Termin ważności",
    "account_tokens_table_never_expires": "Bezterminowy",
    "account_tokens_table_current_session": "Aktualna sesja przeglądarki",
-    "account_tokens_table_copy_to_clipboard": "Kopiuj do schowka",
+    "common_copy_to_clipboard": "Kopiuj do schowka",
    "account_tokens_table_copied_to_clipboard": "Token został skopiowany",
    "account_tokens_table_cannot_delete_or_edit": "Nie można edytować ani usunąć tokenu aktualnej sesji",
    "account_tokens_table_create_token_button": "Utwórz token dostępowy",
--- a/web/public/static/langs/pt.json
+++ b/web/public/static/langs/pt.json
@ -144,7 +144,7 @@
    "subscribe_dialog_login_description": "Esse tópico é protegido por palavra-passe. Por favor insira um nome de utilizador e palavra-passe para subscrever.",
    "subscribe_dialog_login_username_label": "Nome, por exemplo: \"filipe\"",
    "subscribe_dialog_login_password_label": "Palavra-passe",
-    "subscribe_dialog_login_button_back": "Voltar",
+    "common_back": "Voltar",
    "subscribe_dialog_login_button_login": "Autenticar",
    "subscribe_dialog_error_user_anonymous": "anónimo",
    "prefs_notifications_title": "Notificações",
--- a/web/public/static/langs/pt_BR.json
+++ b/web/public/static/langs/pt_BR.json
@ -93,7 +93,7 @@
    "prefs_notifications_min_priority_low_and_higher": "Baixa prioridade e acima",
    "prefs_notifications_min_priority_default_and_higher": "Prioridade padrão e acima",
    "subscribe_dialog_login_password_label": "Senha",
-    "subscribe_dialog_login_button_back": "Voltar",
+    "common_back": "Voltar",
    "prefs_notifications_min_priority_high_and_higher": "Alta prioridade e acima",
    "prefs_notifications_min_priority_max_only": "Apenas prioridade máxima",
    "prefs_notifications_delete_after_title": "Apagar notificações",
--- a/web/public/static/langs/ru.json
+++ b/web/public/static/langs/ru.json
@ -98,7 +98,7 @@
    "subscribe_dialog_login_description": "Эта тема защищена паролем. Пожалуйста, введите имя пользователя и пароль, чтобы подписаться.",
    "subscribe_dialog_login_username_label": "Имя пользователя. Например, phil",
    "subscribe_dialog_login_password_label": "Пароль",
-    "subscribe_dialog_login_button_back": "Назад",
+    "common_back": "Назад",
    "subscribe_dialog_login_button_login": "Войти",
    "subscribe_dialog_error_user_not_authorized": "Пользователь {{username}} не авторизован",
    "subscribe_dialog_error_user_anonymous": "анонимный пользователь",
@ -206,7 +206,7 @@
    "account_basics_tier_free": "Бесплатный",
    "account_tokens_dialog_title_create": "Создать токен доступа",
    "account_tokens_dialog_title_delete": "Удалить токен доступа",
-    "account_tokens_table_copy_to_clipboard": "Скопировать в буфер обмена",
+    "common_copy_to_clipboard": "Скопировать в буфер обмена",
    "account_tokens_dialog_button_cancel": "Отмена",
    "account_tokens_dialog_expires_unchanged": "Оставить срок истечения без изменений",
    "account_tokens_dialog_expires_x_days": "Токен истекает через {{days}} дней",
--- a/web/public/static/langs/sv.json
+++ b/web/public/static/langs/sv.json
@ -95,14 +95,14 @@
    "publish_dialog_email_placeholder": "Adress att vidarebefordra meddelandet till, t.ex. phil@example.com",
    "publish_dialog_details_examples_description": "Exempel och en detaljerad beskrivning av alla sändningsfunktioner finns i <docsLink>dokumentationen</docsLink> .",
    "publish_dialog_button_send": "Skicka",
-    "subscribe_dialog_login_button_back": "Tillbaka",
+    "common_back": "Tillbaka",
    "account_basics_tier_free": "Gratis",
    "account_upgrade_dialog_tier_features_reservations_one": "{{reservations}} reserverat ämne",
    "account_delete_title": "Ta bort konto",
    "account_upgrade_dialog_tier_features_messages_other": "{{messages}} dagliga meddelanden",
    "account_upgrade_dialog_tier_features_emails_one": "{{emails}} dagligt e-postmeddelande",
    "account_upgrade_dialog_button_cancel": "Avbryt",
-    "account_tokens_table_copy_to_clipboard": "Kopiera till urklipp",
+    "common_copy_to_clipboard": "Kopiera till urklipp",
    "account_tokens_table_copied_to_clipboard": "Åtkomsttoken kopierat",
    "account_tokens_description": "Använd åtkomsttoken när du publicerar och prenumererar via ntfy API, så att du inte behöver skicka dina kontouppgifter. Läs mer i <Link>dokumentationen</Link>.",
    "account_tokens_table_create_token_button": "Skapa åtkomsttoken",
--- a/web/public/static/langs/tr.json
+++ b/web/public/static/langs/tr.json
@ -34,7 +34,7 @@
    "subscribe_dialog_login_description": "Bu konu parola korumalı. Abone olmak için lütfen kullanıcı adı ve parola girin.",
    "subscribe_dialog_login_username_label": "Kullanıcı adı, örn. phil",
    "subscribe_dialog_login_password_label": "Parola",
-    "subscribe_dialog_login_button_back": "Geri",
+    "common_back": "Geri",
    "subscribe_dialog_login_button_login": "Oturum aç",
    "subscribe_dialog_error_user_not_authorized": "{{username}} kullanıcısı yetkili değil",
    "subscribe_dialog_error_user_anonymous": "anonim",
@ -268,7 +268,7 @@
    "account_tokens_table_token_header": "Belirteç",
    "account_tokens_table_label_header": "Etiket",
    "account_tokens_table_current_session": "Geçerli tarayıcı oturumu",
-    "account_tokens_table_copy_to_clipboard": "Panoya kopyala",
+    "common_copy_to_clipboard": "Panoya kopyala",
    "account_tokens_table_copied_to_clipboard": "Erişim belirteci kopyalandı",
    "account_tokens_table_cannot_delete_or_edit": "Geçerli oturum belirteci düzenlenemez veya silinemez",
    "account_tokens_table_create_token_button": "Erişim belirteci oluştur",
--- a/web/public/static/langs/uk.json
+++ b/web/public/static/langs/uk.json
@ -53,7 +53,7 @@
    "subscribe_dialog_subscribe_use_another_label": "Використовувати інший сервер",
    "subscribe_dialog_subscribe_base_url_label": "URL служби",
    "subscribe_dialog_login_password_label": "Пароль",
-    "subscribe_dialog_login_button_back": "Назад",
+    "common_back": "Назад",
    "subscribe_dialog_error_user_not_authorized": "{{username}} користувач не авторизований",
    "prefs_notifications_sound_description_none": "Сповіщення не відтворюють жодного звуку при надходженні",
    "prefs_notifications_sound_description_some": "Сповіщення відтворюють звук {{sound}}",
--- a/web/public/static/langs/zh_Hans.json
+++ b/web/public/static/langs/zh_Hans.json
@ -103,7 +103,7 @@
    "subscribe_dialog_login_description": "本主题受密码保护，请输入用户名和密码进行订阅。",
    "subscribe_dialog_login_username_label": "用户名，例如 phil",
    "subscribe_dialog_login_password_label": "密码",
-    "subscribe_dialog_login_button_back": "返回",
+    "common_back": "返回",
    "subscribe_dialog_login_button_login": "登录",
    "subscribe_dialog_error_user_not_authorized": "未授权 {{username}} 用户",
    "subscribe_dialog_error_user_anonymous": "匿名",
@ -333,7 +333,7 @@
    "account_tokens_table_expires_header": "过期",
    "account_tokens_table_never_expires": "永不过期",
    "account_tokens_table_current_session": "当前浏览器会话",
-    "account_tokens_table_copy_to_clipboard": "复制到剪贴板",
+    "common_copy_to_clipboard": "复制到剪贴板",
    "account_tokens_table_copied_to_clipboard": "已复制访问令牌",
    "account_tokens_table_cannot_delete_or_edit": "无法编辑或删除当前会话令牌",
    "account_tokens_table_create_token_button": "创建访问令牌",
--- a/web/public/static/langs/zh_Hant.json
+++ b/web/public/static/langs/zh_Hant.json
@ -70,7 +70,7 @@
    "subscribe_dialog_subscribe_button_subscribe": "訂閱",
    "emoji_picker_search_clear": "清除",
    "subscribe_dialog_login_password_label": "密碼",
-    "subscribe_dialog_login_button_back": "返回",
+    "common_back": "返回",
    "subscribe_dialog_login_button_login": "登入",
    "prefs_notifications_delete_after_never": "從不",
    "prefs_users_add_button": "新增使用者",
--- a/web/src/app/AccountApi.js
+++ b/web/src/app/AccountApi.js
@ -2,13 +2,15 @@ import {
    accountBillingPortalUrl,
    accountBillingSubscriptionUrl,
    accountPasswordUrl,
+    accountPhoneUrl,
+    accountPhoneVerifyUrl,
    accountReservationSingleUrl,
    accountReservationUrl,
    accountSettingsUrl,
-    accountSubscriptionSingleUrl,
    accountSubscriptionUrl,
    accountTokenUrl,
-    accountUrl, maybeWithBearerAuth,
+    accountUrl,
+    maybeWithBearerAuth,
    tiersUrl,
    withBasicAuth,
    withBearerAuth
@ -18,7 +20,7 @@ import subscriptionManager from "./SubscriptionManager";
 import i18n from "i18next";
 import prefs from "./Prefs";
 import routes from "../components/routes";
-import {fetchOrThrow, throwAppError, UnauthorizedError} from "./errors";
+import {fetchOrThrow, UnauthorizedError} from "./errors";

 const delayMillis = 45000; // 45 seconds
 const intervalMillis = 900000; // 15 minutes
@ -299,6 +301,44 @@ class AccountApi {
        return await response.json(); // May throw SyntaxError
    }

+    async verifyPhoneNumber(phoneNumber, channel) {
+        const url = accountPhoneVerifyUrl(config.base_url);
+        console.log(`[AccountApi] Sending phone verification ${url}`);
+        await fetchOrThrow(url, {
+            method: "PUT",
+            headers: withBearerAuth({}, session.token()),
+            body: JSON.stringify({
+                number: phoneNumber,
+                channel: channel
+            })
+        });
+    }
+
+    async addPhoneNumber(phoneNumber, code) {
+        const url = accountPhoneUrl(config.base_url);
+        console.log(`[AccountApi] Adding phone number with verification code ${url}`);
+        await fetchOrThrow(url, {
+            method: "PUT",
+            headers: withBearerAuth({}, session.token()),
+            body: JSON.stringify({
+                number: phoneNumber,
+                code: code
+            })
+        });
+    }
+
+    async deletePhoneNumber(phoneNumber, code) {
+        const url = accountPhoneUrl(config.base_url);
+        console.log(`[AccountApi] Deleting phone number ${url}`);
+        await fetchOrThrow(url, {
+            method: "DELETE",
+            headers: withBearerAuth({}, session.token()),
+            body: JSON.stringify({
+                number: phoneNumber
+            })
+        });
+    }
+
    async sync() {
        try {
            if (!session.token()) {
--- a/web/src/app/utils.js
+++ b/web/src/app/utils.js
@ -27,6 +27,8 @@ export const accountReservationUrl = (baseUrl) => `${baseUrl}/v1/account/reserva
 export const accountReservationSingleUrl = (baseUrl, topic) => `${baseUrl}/v1/account/reservation/${topic}`;
 export const accountBillingSubscriptionUrl = (baseUrl) => `${baseUrl}/v1/account/billing/subscription`;
 export const accountBillingPortalUrl = (baseUrl) => `${baseUrl}/v1/account/billing/portal`;
+export const accountPhoneUrl = (baseUrl) => `${baseUrl}/v1/account/phone`;
+export const accountPhoneVerifyUrl = (baseUrl) => `${baseUrl}/v1/account/phone/verify`;
 export const tiersUrl = (baseUrl) => `${baseUrl}/v1/tiers`;
 export const shortUrl = (url) => url.replaceAll(/https?:\/\//g, "");
 export const expandUrl = (url) => [`https://${url}`, `http://${url}`];
@ -206,10 +208,12 @@ export const formatBytes = (bytes, decimals = 2) => {
 }

 export const formatNumber = (n) => {
-    if (n % 1000 === 0) {
+    if (n === 0) {
+        return n;
+    } else if (n % 1000 === 0) {
        return `${n/1000}k`;
    }
-    return n;
+    return n.toLocaleString();
 }

 export const formatPrice = (n) => {
--- a/web/src/components/Account.js
+++ b/web/src/components/Account.js
@ -4,10 +4,14 @@ import {
    Alert,
    CardActions,
    CardContent,
+    Chip,
    FormControl,
+    FormControlLabel,
    LinearProgress,
    Link,
    Portal,
+    Radio,
+    RadioGroup,
    Select,
    Snackbar,
    Stack,
@ -51,6 +55,8 @@ import {ContentCopy, Public} from "@mui/icons-material";
 import MenuItem from "@mui/material/MenuItem";
 import DialogContentText from "@mui/material/DialogContentText";
 import {IncorrectPasswordError, UnauthorizedError} from "../app/errors";
+import {ProChip} from "./SubscriptionPopup";
+import AddIcon from "@mui/icons-material/Add";

 const Account = () => {
    if (!session.exists()) {
@ -79,6 +85,7 @@ const Basics = () => {
            <PrefGroup>
                <Username/>
                <ChangePassword/>
+                <PhoneNumbers/>
                <AccountType/>
            </PrefGroup>
        </Card>
@ -319,6 +326,206 @@ const AccountType = () => {
    )
 };

+const PhoneNumbers = () => {
+    const { t } = useTranslation();
+    const { account } = useContext(AccountContext);
+    const [dialogKey, setDialogKey] = useState(0);
+    const [dialogOpen, setDialogOpen] = useState(false);
+    const [snackOpen, setSnackOpen] = useState(false);
+    const labelId = "prefPhoneNumbers";
+
+    const handleDialogOpen = () => {
+        setDialogKey(prev => prev+1);
+        setDialogOpen(true);
+    };
+
+    const handleDialogClose = () => {
+        setDialogOpen(false);
+    };
+
+    const handleCopy = (phoneNumber) => {
+        navigator.clipboard.writeText(phoneNumber);
+        setSnackOpen(true);
+    };
+
+    const handleDelete = async (phoneNumber) => {
+        try {
+            await accountApi.deletePhoneNumber(phoneNumber);
+        } catch (e) {
+            console.log(`[Account] Error deleting phone number`, e);
+            if (e instanceof UnauthorizedError) {
+                session.resetAndRedirect(routes.login);
+            }
+        }
+    };
+
+    if (!config.enable_calls) {
+        return null;
+    }
+
+    if (account?.limits.calls === 0) {
+        return (
+            <Pref title={<>{t("account_basics_phone_numbers_title")}{config.enable_payments && <ProChip/>}</>} description={t("account_basics_phone_numbers_description")}>
+                <em>{t("account_usage_calls_none")}</em>
+            </Pref>
+        )
+    }
+
+    return (
+        <Pref labelId={labelId} title={t("account_basics_phone_numbers_title")} description={t("account_basics_phone_numbers_description")}>
+            <div aria-labelledby={labelId}>
+                {account?.phone_numbers?.map(phoneNumber =>
+                        <Chip
+                            label={
+                                <Tooltip title={t("common_copy_to_clipboard")}>
+                                   <span>{phoneNumber}</span>
+                                </Tooltip>
+                            }
+                            variant="outlined"
+                            onClick={() => handleCopy(phoneNumber)}
+                            onDelete={() => handleDelete(phoneNumber)}
+                        />
+                )}
+                {!account?.phone_numbers &&
+                    <em>{t("account_basics_phone_numbers_no_phone_numbers_yet")}</em>
+                }
+                <IconButton onClick={handleDialogOpen}><AddIcon/></IconButton>
+            </div>
+            <AddPhoneNumberDialog
+                key={`addPhoneNumberDialog${dialogKey}`}
+                open={dialogOpen}
+                onClose={handleDialogClose}
+            />
+            <Portal>
+                <Snackbar
+                    open={snackOpen}
+                    autoHideDuration={3000}
+                    onClose={() => setSnackOpen(false)}
+                    message={t("account_basics_phone_numbers_copied_to_clipboard")}
+                />
+            </Portal>
+        </Pref>
+    )
+};
+
+const AddPhoneNumberDialog = (props) => {
+    const { t } = useTranslation();
+    const [error, setError] = useState("");
+    const [phoneNumber, setPhoneNumber] = useState("");
+    const [channel, setChannel] = useState("sms");
+    const [code, setCode] = useState("");
+    const [sending, setSending] = useState(false);
+    const [verificationCodeSent, setVerificationCodeSent] = useState(false);
+    const fullScreen = useMediaQuery(theme.breakpoints.down('sm'));
+
+    const handleDialogSubmit = async () => {
+        if (!verificationCodeSent) {
+            await verifyPhone();
+        } else {
+            await checkVerifyPhone();
+        }
+    };
+
+    const handleCancel = () => {
+        if (verificationCodeSent) {
+            setVerificationCodeSent(false);
+            setCode("");
+        } else {
+            props.onClose();
+        }
+    };
+
+    const verifyPhone = async () => {
+        try {
+            setSending(true);
+            await accountApi.verifyPhoneNumber(phoneNumber, channel);
+            setVerificationCodeSent(true);
+        } catch (e) {
+            console.log(`[Account] Error sending verification`, e);
+            if (e instanceof UnauthorizedError) {
+                session.resetAndRedirect(routes.login);
+            } else {
+                setError(e.message);
+            }
+        } finally {
+            setSending(false);
+        }
+    };
+
+    const checkVerifyPhone = async () => {
+        try {
+            setSending(true);
+            await accountApi.addPhoneNumber(phoneNumber, code);
+            props.onClose();
+        } catch (e) {
+            console.log(`[Account] Error confirming verification`, e);
+            if (e instanceof UnauthorizedError) {
+                session.resetAndRedirect(routes.login);
+            } else {
+                setError(e.message);
+            }
+        } finally {
+            setSending(false);
+        }
+    };
+
+    return (
+        <Dialog open={props.open} onClose={props.onCancel} fullScreen={fullScreen}>
+            <DialogTitle>{t("account_basics_phone_numbers_dialog_title")}</DialogTitle>
+            <DialogContent>
+                <DialogContentText>
+                    {t("account_basics_phone_numbers_dialog_description")}
+                </DialogContentText>
+                {!verificationCodeSent &&
+                    <div style={{display: "flex"}}>
+                        <TextField
+                            margin="dense"
+                            label={t("account_basics_phone_numbers_dialog_number_label")}
+                            aria-label={t("account_basics_phone_numbers_dialog_number_label")}
+                            placeholder={t("account_basics_phone_numbers_dialog_number_placeholder")}
+                            type="tel"
+                            value={phoneNumber}
+                            onChange={ev => setPhoneNumber(ev.target.value)}
+                            inputProps={{ inputMode: 'tel', pattern: '\+[0-9]*' }}
+                            variant="standard"
+                            sx={{ flexGrow: 1 }}
+                        />
+                        <FormControl sx={{ flexWrap: "nowrap" }}>
+                            <RadioGroup row sx={{ flexGrow: 1, marginTop: "8px", marginLeft: "5px" }}>
+                                <FormControlLabel value="sms" control={<Radio checked={channel === "sms"} onChange={(e) => setChannel(e.target.value)} />} label={t("account_basics_phone_numbers_dialog_channel_sms")} />
+                                <FormControlLabel value="call" control={<Radio checked={channel === "call"} onChange={(e) => setChannel(e.target.value)} />} label={t("account_basics_phone_numbers_dialog_channel_call")} sx={{ marginRight: 0 }} />
+                            </RadioGroup>
+                        </FormControl>
+                    </div>
+                }
+                {verificationCodeSent &&
+                    <TextField
+                        margin="dense"
+                        label={t("account_basics_phone_numbers_dialog_code_label")}
+                        aria-label={t("account_basics_phone_numbers_dialog_code_label")}
+                        placeholder={t("account_basics_phone_numbers_dialog_code_placeholder")}
+                        type="text"
+                        value={code}
+                        onChange={ev => setCode(ev.target.value)}
+                        fullWidth
+                        inputProps={{ inputMode: 'numeric', pattern: '[0-9]*' }}
+                        variant="standard"
+                    />
+                }
+            </DialogContent>
+            <DialogFooter status={error}>
+                <Button onClick={handleCancel}>{verificationCodeSent ? t("common_back") : t("common_cancel")}</Button>
+                <Button onClick={handleDialogSubmit} disabled={sending || !/^\+\d+$/.test(phoneNumber)}>
+                    {!verificationCodeSent && channel === "sms" && t("account_basics_phone_numbers_dialog_verify_button_sms")}
+                    {!verificationCodeSent && channel === "call" && t("account_basics_phone_numbers_dialog_verify_button_call")}
+                    {verificationCodeSent && t("account_basics_phone_numbers_dialog_check_verification_button")}
+                </Button>
+            </DialogFooter>
+        </Dialog>
+    );
+};
+
+
 const Stats = () => {
    const { t } = useTranslation();
    const { account } = useContext(AccountContext);
@ -337,23 +544,18 @@ const Stats = () => {
                {t("account_usage_title")}
            </Typography>
            <PrefGroup>
-                <Pref title={t("account_usage_reservations_title")}>
-                    {(account.role === Role.ADMIN || account.limits.reservations > 0) &&
-                        <>
-                            <div>
-                                <Typography variant="body2" sx={{float: "left"}}>{account.stats.reservations}</Typography>
-                                <Typography variant="body2" sx={{float: "right"}}>{account.role === Role.USER ? t("account_usage_of_limit", {limit: account.limits.reservations}) : t("account_usage_unlimited")}</Typography>
-                            </div>
-                            <LinearProgress
-                                variant="determinate"
-                                value={account.role === Role.USER && account.limits.reservations > 0 ? normalize(account.stats.reservations, account.limits.reservations) : 100}
-                            />
-                        </>
-                    }
-                    {account.role === Role.USER && account.limits.reservations === 0 &&
-                        <em>{t("account_usage_reservations_none")}</em>
-                    }
-                </Pref>
+                {(account.role === Role.ADMIN || account.limits.reservations > 0) &&
+                    <Pref title={t("account_usage_reservations_title")}>
+                        <div>
+                            <Typography variant="body2" sx={{float: "left"}}>{account.stats.reservations.toLocaleString()}</Typography>
+                            <Typography variant="body2" sx={{float: "right"}}>{account.role === Role.USER ? t("account_usage_of_limit", { limit: account.limits.reservations.toLocaleString() }) : t("account_usage_unlimited")}</Typography>
+                        </div>
+                        <LinearProgress
+                            variant="determinate"
+                            value={account.role === Role.USER && account.limits.reservations > 0 ? normalize(account.stats.reservations, account.limits.reservations) : 100}
+                        />
+                    </Pref>
+                }
                <Pref title={
                    <>
                        {t("account_usage_messages_title")}
@ -361,29 +563,48 @@ const Stats = () => {
                    </>
                }>
                    <div>
-                        <Typography variant="body2" sx={{float: "left"}}>{account.stats.messages}</Typography>
-                        <Typography variant="body2" sx={{float: "right"}}>{account.role === Role.USER ? t("account_usage_of_limit", { limit: account.limits.messages }) : t("account_usage_unlimited")}</Typography>
+                        <Typography variant="body2" sx={{float: "left"}}>{account.stats.messages.toLocaleString()}</Typography>
+                        <Typography variant="body2" sx={{float: "right"}}>{account.role === Role.USER ? t("account_usage_of_limit", { limit: account.limits.messages.toLocaleString() }) : t("account_usage_unlimited")}</Typography>
                    </div>
                    <LinearProgress
                        variant="determinate"
                        value={account.role === Role.USER ? normalize(account.stats.messages, account.limits.messages) : 100}
                    />
                </Pref>
-                <Pref title={
-                    <>
-                        {t("account_usage_emails_title")}
-                        <Tooltip title={t("account_usage_limits_reset_daily")}><span><InfoIcon/></span></Tooltip>
-                    </>
-                }>
-                    <div>
-                        <Typography variant="body2" sx={{float: "left"}}>{account.stats.emails}</Typography>
-                        <Typography variant="body2" sx={{float: "right"}}>{account.role === Role.USER ? t("account_usage_of_limit", { limit: account.limits.emails }) : t("account_usage_unlimited")}</Typography>
-                    </div>
-                    <LinearProgress
-                        variant="determinate"
-                        value={account.role === Role.USER ? normalize(account.stats.emails, account.limits.emails) : 100}
-                    />
-                </Pref>
+                {config.enable_emails &&
+                    <Pref title={
+                        <>
+                            {t("account_usage_emails_title")}
+                            <Tooltip title={t("account_usage_limits_reset_daily")}><span><InfoIcon/></span></Tooltip>
+                        </>
+                    }>
+                        <div>
+                            <Typography variant="body2" sx={{float: "left"}}>{account.stats.emails.toLocaleString()}</Typography>
+                            <Typography variant="body2" sx={{float: "right"}}>{account.role === Role.USER ? t("account_usage_of_limit", { limit: account.limits.emails.toLocaleString() }) : t("account_usage_unlimited")}</Typography>
+                        </div>
+                        <LinearProgress
+                            variant="determinate"
+                            value={account.role === Role.USER ? normalize(account.stats.emails, account.limits.emails) : 100}
+                        />
+                    </Pref>
+                }
+                {config.enable_calls && (account.role === Role.ADMIN || account.limits.calls > 0) &&
+                    <Pref title={
+                        <>
+                            {t("account_usage_calls_title")}
+                            <Tooltip title={t("account_usage_limits_reset_daily")}><span><InfoIcon/></span></Tooltip>
+                        </>
+                    }>
+                        <div>
+                            <Typography variant="body2" sx={{float: "left"}}>{account.stats.calls.toLocaleString()}</Typography>
+                            <Typography variant="body2" sx={{float: "right"}}>{account.role === Role.USER ? t("account_usage_of_limit", { limit: account.limits.calls.toLocaleString() }) : t("account_usage_unlimited")}</Typography>
+                        </div>
+                        <LinearProgress
+                            variant="determinate"
+                            value={account.role === Role.USER && account.limits.calls > 0 ? normalize(account.stats.calls, account.limits.calls) : 100}
+                        />
+                    </Pref>
+                }
                <Pref
                    alignTop
                    title={t("account_usage_attachment_storage_title")}
@ -404,6 +625,16 @@ const Stats = () => {
                        value={account.role === Role.USER ? normalize(account.stats.attachment_total_size, account.limits.attachment_total_size) : 100}
                    />
                </Pref>
+                {config.enable_reservations && account.role === Role.USER && account.limits.reservations === 0 &&
+                    <Pref title={<>{t("account_usage_reservations_title")}{config.enable_payments && <ProChip/>}</>}>
+                        <em>{t("account_usage_reservations_none")}</em>
+                    </Pref>
+                }
+                {config.enable_calls && account.role === Role.USER && account.limits.calls === 0 &&
+                    <Pref title={<>{t("account_usage_calls_title")}{config.enable_payments && <ProChip/>}</>}>
+                        <em>{t("account_usage_calls_none")}</em>
+                    </Pref>
+                }
            </PrefGroup>
            {account.role === Role.USER && account.limits.basis === LimitBasis.IP &&
                <Typography variant="body1">
@ -535,7 +766,7 @@ const TokensTable = (props) => {
                            <span>
                                <span style={{fontFamily: "Monospace", fontSize: "0.9rem"}}>{token.token.slice(0, 12)}</span>
                                ...
-                                <Tooltip title={t("account_tokens_table_copy_to_clipboard")} placement="right">
+                                <Tooltip title={t("common_copy_to_clipboard")} placement="right">
                                    <IconButton onClick={() => handleCopy(token.token)}><ContentCopy/></IconButton>
                                </Tooltip>
                            </span>
--- a/web/src/components/PublishDialog.js
+++ b/web/src/components/PublishDialog.js
@ -45,6 +45,7 @@ const PublishDialog = (props) => {
    const [filename, setFilename] = useState("");
    const [filenameEdited, setFilenameEdited] = useState(false);
    const [email, setEmail] = useState("");
+    const [call, setCall] = useState("");
    const [delay, setDelay] = useState("");
    const [publishAnother, setPublishAnother] = useState(false);

@ -52,6 +53,7 @@ const PublishDialog = (props) => {
    const [showClickUrl, setShowClickUrl] = useState(false);
    const [showAttachUrl, setShowAttachUrl] = useState(false);
    const [showEmail, setShowEmail] = useState(false);
+    const [showCall, setShowCall] = useState(false);
    const [showDelay, setShowDelay] = useState(false);

    const showAttachFile = !!attachFile && !showAttachUrl;
@ -124,6 +126,9 @@ const PublishDialog = (props) => {
        if (email.trim()) {
            url.searchParams.append("email", email.trim());
        }
+        if (call.trim()) {
+            url.searchParams.append("call", call.trim());
+        }
        if (delay.trim()) {
            url.searchParams.append("delay", delay.trim());
        }
@ -406,6 +411,27 @@ const PublishDialog = (props) => {
                            />
                        </ClosableRow>
                    }
+                    {showCall &&
+                        <ClosableRow disabled={disabled} closeLabel={t("publish_dialog_call_reset")} onClose={() => {
+                            setCall("");
+                            setShowCall(false);
+                        }}>
+                            <TextField
+                                margin="dense"
+                                label={t("publish_dialog_call_label")}
+                                placeholder={t("publish_dialog_call_placeholder")}
+                                value={call}
+                                onChange={ev => setCall(ev.target.value)}
+                                disabled={disabled}
+                                type="tel"
+                                variant="standard"
+                                fullWidth
+                                inputProps={{
+                                    "aria-label": t("publish_dialog_call_label")
+                                }}
+                            />
+                        </ClosableRow>
+                    }
                    {showAttachUrl &&
                        <ClosableRow disabled={disabled} closeLabel={t("publish_dialog_attach_reset")} onClose={() => {
                            setAttachUrl("");
@ -510,6 +536,7 @@ const PublishDialog = (props) => {
                    <div>
                        {!showClickUrl && <Chip clickable disabled={disabled} label={t("publish_dialog_chip_click_label")} aria-label={t("publish_dialog_chip_click_label")} onClick={() => setShowClickUrl(true)} sx={{marginRight: 1, marginBottom: 1}}/>}
                        {!showEmail && <Chip clickable disabled={disabled} label={t("publish_dialog_chip_email_label")} aria-label={t("publish_dialog_chip_email_label")} onClick={() => setShowEmail(true)} sx={{marginRight: 1, marginBottom: 1}}/>}
+                        {!showCall && <Chip clickable disabled={disabled} label={t("publish_dialog_chip_call_label")} aria-label={t("publish_dialog_chip_call_label")} onClick={() => setShowCall(true)} sx={{marginRight: 1, marginBottom: 1}}/>}
                        {!showAttachUrl && !showAttachFile && <Chip clickable disabled={disabled} label={t("publish_dialog_chip_attach_url_label")} aria-label={t("publish_dialog_chip_attach_url_label")} onClick={() => setShowAttachUrl(true)} sx={{marginRight: 1, marginBottom: 1}}/>}
                        {!showAttachFile && !showAttachUrl && <Chip clickable disabled={disabled} label={t("publish_dialog_chip_attach_file_label")} aria-label={t("publish_dialog_chip_attach_file_label")} onClick={() => handleAttachFileClick()} sx={{marginRight: 1, marginBottom: 1}}/>}
                        {!showDelay && <Chip clickable disabled={disabled} label={t("publish_dialog_chip_delay_label")} aria-label={t("publish_dialog_chip_delay_label")} onClick={() => setShowDelay(true)} sx={{marginRight: 1, marginBottom: 1}}/>}
--- a/web/src/components/SubscribeDialog.js
+++ b/web/src/components/SubscribeDialog.js
@ -288,7 +288,7 @@ const LoginPage = (props) => {
                />
            </DialogContent>
            <DialogFooter status={error}>
-                <Button onClick={props.onBack}>{t("subscribe_dialog_login_button_back")}</Button>
+                <Button onClick={props.onBack}>{t("common_back")}</Button>
                <Button onClick={handleLogin}>{t("subscribe_dialog_login_button_login")}</Button>
            </DialogFooter>
        </>
--- a/web/src/components/SubscriptionPopup.js
+++ b/web/src/components/SubscriptionPopup.js
@ -277,14 +277,14 @@ const LimitReachedChip = () => {
    );
 };

-const ProChip = () => {
+export const ProChip = () => {
    const { t } = useTranslation();
    return (
        <Chip
            label={"ntfy Pro"}
            variant="outlined"
            color="primary"
-            sx={{ opacity: 0.8, borderWidth: "2px", height: "24px", marginLeft: "5px" }}
+            sx={{ opacity: 0.8, fontWeight: "bold", borderWidth: "2px", height: "24px", marginLeft: "5px" }}
        />
    );
 };
--- a/web/src/components/UpgradeDialog.js
+++ b/web/src/components/UpgradeDialog.js
@ -298,11 +298,12 @@ const TierCard = (props) => {
                        </div>
                        <List dense>
                            {tier.limits.reservations > 0 && <Feature>{t("account_upgrade_dialog_tier_features_reservations", { reservations: tier.limits.reservations, count: tier.limits.reservations })}</Feature>}
-                            {tier.limits.reservations === 0 && <NoFeature>{t("account_upgrade_dialog_tier_features_no_reservations")}</NoFeature>}
                            <Feature>{t("account_upgrade_dialog_tier_features_messages", { messages: formatNumber(tier.limits.messages), count: tier.limits.messages })}</Feature>
                            <Feature>{t("account_upgrade_dialog_tier_features_emails", { emails: formatNumber(tier.limits.emails), count: tier.limits.emails })}</Feature>
+                            {tier.limits.calls > 0 && <Feature>{t("account_upgrade_dialog_tier_features_calls", { calls: formatNumber(tier.limits.calls), count: tier.limits.calls })}</Feature>}
                            <Feature>{t("account_upgrade_dialog_tier_features_attachment_file_size", { filesize: formatBytes(tier.limits.attachment_file_size, 0) })}</Feature>
-                            <Feature>{t("account_upgrade_dialog_tier_features_attachment_total_size", { totalsize: formatBytes(tier.limits.attachment_total_size, 0) })}</Feature>
+                            {tier.limits.reservations === 0 && <NoFeature>{t("account_upgrade_dialog_tier_features_no_reservations")}</NoFeature>}
+                            {tier.limits.calls === 0 && <NoFeature>{t("account_upgrade_dialog_tier_features_no_calls")}</NoFeature>}
                        </List>
                        {tier.prices && props.interval === SubscriptionInterval.MONTH &&
                            <Typography variant="body2" color="gray">