SMS
A text the moment something breaks
Delivered via Twilio, kept short since SMS is billed and split into segments -- a Business-plan channel, since it's a real per-message cost regardless of who's sending it.
- A Business-plan channel -- see the pricing page for why SMS and voice call are the two gated ones
- Requires a phone number in E.164 format (a leading + and country code, e.g. +15551234567)
- Truncated harder than a Slack or webhook message: no project name, no event count, just the trigger and title
Short on purpose
SMS is billed and split into roughly 160-character segments, so the message skips the extra context a Slack alert includes (project name, event count) and truncates the issue title harder instead. It still links back to the issue or heartbeat, just without the surrounding detail.
Delivery goes through Twilio's Messages API using an operator-wide Twilio account, not one each organization brings its own keys for -- the same account SMS and Call both use.
SMS and Call both take a phone number in the same target field.