AT&T Landline Account Number, PIN & Port Out
For AT&T landline accounts, your account # is the 10-digit phone number. The PIN is the 4 digits to the immediate right of the phone number in the top right corner of your bill.
AT&T Postpaid Account Number, PIN & Port Out
The account number for AT&T postpaid accounts will be on the customers bill (it is NOT the phone number). The password will be your online password. For bundled accounts, the account number will be a 12-digit number under your wireless account summary. Also, (only for bundled bills) you will need to call AT&T customer service for the passcode. The passcode will be a 4-digit PIN number that AT&T will provide to you.