We'd be more than happy to take a closer look into why you have no service after changing your wireless phone number. Please be sure that you have followed the correct Steps to change your wireless number. Also, remember that there isn't a feature to provide callers with your new number. Callers dialing your old number will hear: The number you dialed is not a working number, please check the number and dial again. Let us know if you have any further questions or concerns.
Sean, AT&T Community Specialist
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