It is up to your gaining carrier to complete re-routing of SMS messages on a ported number. If you experience any issues sending or receiving SMS messages after you port your number away from Twilio, please reach out to your new carrier to ensure that they’ve fully ported your number, including re-routing SMS messages. Once a number has fully ported away from Twilio, we are unable to route SMS messages because we no longer have control over the number.
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