How do I port my active AT&T “go phone” (pre-paid) number to my new Xfinity mobile phone?
From ATT rep:
"Your GoPhone number is not the same as your account number. To obtain your account number for your GoPhone account, you must call Customer Support at 800-901-9878. When you are required to validate in order to acquire your account number, you will be required to provide your GoPhone PIN number which was created upon first time setup of your account."
That's correct. You'll need to get your account number and pin number from the ATT Prepaid team. I found this number, though: 888-898-7685