# Alert channels

> Wake alerts push first and call second. Tell alerts go to one place. Every channel is tested once a day so a broken one is found before you need it.

URL: https://pagerless.dev/docs/alert-channels
Updated: 2026-10-22

| Channel | Used for | Notes |
| --- | --- | --- |
| iPhone app | Wake and tell | Time-Sensitive notifications with Approve, I'm on it, Take over and Open. Approve with Face ID. |
| Phone call | Wake, after 5 minutes without a tap | Through your own Twilio account. Reads the problem aloud with fixed wording; press 1 to acknowledge. |
| Slack | Tell, and wake's first step | Posts to a channel you choose. |
| Telegram | Tell, and wake's first step | Messages from a bot to you. |
| Email | Tell and the weekly summary | One email per person per week with what happened. |
| Webhook | Anything | Signed with HMAC-SHA256 in `Pagerless-Signature: t=…,v1=…`. |

## Not available

- SMS: there is no SMS channel.
- Android: no Android app yet.
- Silent-mode bypass (Critical Alerts) on iPhone: requested from Apple, not granted yet. Pagerless uses Time-Sensitive notifications, which break through Focus but not the silent switch, and follows up with a phone call.

## Quiet hours

Set start, end and time zone for your account. Tell alerts wait until quiet hours end. Wake alerts always go through. Each channel can override the account setting.