How can users unsubscribe or stop receiving my SMS messages?
If you are using the Twilio integration, they can simply reply STOP, STOPALL, UNSUBSCRIBE, CANCEL, END, or QUIT to any of your SMS. No new messages will be sent to their phone number.
They will receive the next message: "You have successfully been unsubscribed. You will not receive any more messages from this number. Reply START to resubscribe."