Mobile Notifications
Special behavior for Toll-Free numbers: US
If your Messaging Service includes Toll-Free US numbers and you are sending to or receiving from the US or Canada, be aware of the following special behavior:
- Toll-Free US numbers always unsubscribe a user who replies STOP, so the Advanced Opt-out custom message will not display.
- Toll-Free US numbers always opt-in a user who replies START, UNSTOP, so both the carrier opt-in message and the Advanced Opt-out custom message will be returned.
- Only the keywords START and UNSTOP can fully undo the blocking. Twilio’s supported keyword “YES” will not work to opt-in a previously unsubscribed user.
If using a Toll-Free US number to communicate with your users, make sure to communicate the STOP and START/UNSTOP keywords to them.
Special behavior for Toll-Free numbers: Canada
If your Messaging Service includes Toll-Free US numbers and you are sending to or receiving from the US or Canada, be aware of the following special behavior:
- Toll-Free US numbers always unsubscribe a user who replies STOP, so the Advanced Opt-out custom message will not display.
- Toll-Free US numbers always opt-in a user who replies START, UNSTOP, so both the carrier opt-in message and the Advanced Opt-out custom message will be returned.
- Only the keywords START and UNSTOP can fully undo the blocking. Twilio’s supported keyword “YES” will not work to opt-in a previously unsubscribed user.
If using a Toll-Free US number to communicate with your users, make sure to communicate the STOP and START/UNSTOP keywords to them.
