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Problem with changing phone number
Today I became your client and when I came home I decided to change my phone number by following this instruction: http://www.att.com/olam/passthroughAction.myworld?actionType=MobileNumberChange
But I can't change the number due to an error: "Please provide valid input data. (MNC12)"
3 months ago
Hello there @Kromster, that's not the experience we want you to have with attempting to changing your phone number.
Let's meet in a Direct Message, by locating the chat icon next to the bell icon in the upper right-hand corner of the forums page.
What to know before you change your number
We look forward to chatting with you soon.
Ashley, AT&T Community Specialist