Twilio automatically handles
STOP and certain other keywords when users text them into your Twilio ten-digit (long code) phone number. This is to help ensure that your messaging app complies with recommended practices for the commercial use of SMS.
For more details, please see Twilio support for opt-out keywords (SMS STOP filtering).
Notice: We do not have a way for developers to customize the specific replies used in SMS filtering for ten-digit (long code) phone numbers. If you have further questions about this, please feel free to contact our Support team.
Twilio does not handle your
STOP replies, or your opt-out list for Short Codes. You should build this functionality into your own short code messaging application.
For information on carriers’ requirements for short code
STOP replies, please see the following resources: