AT&T Postpaid Account Number, Password & Contact Info

Contact Information for Cellphone Service ProvidersThis is a brief overview of AT&T Postpaid and how to get the information you will need if you wish to port your phone number out to a different company. You can use the information below to get your AT&T Postpaid account number and password.

AT&T Postpaid Contact Info

Customer Service: 1-800-331-0500
Hours: Monday – Sunday: 8:00AM – 9:00PM | Order new service: Monday – Friday: 8:00AM – 12:00AM | Saturday and Sunday: 8:00AM – 11:00PM

  • Sales: N/A
  • Dealer Support: N/A
  • Fraud: N/A
  • Insurance: N/A
  • Porting Department: 1-888-898-7685
  • Tech Support: N/A

Carrier(s) used by AT&T Postpaid

  • (CDMA): NO
  • (GSM-A): AT&T
  • (GSM-T): NO
  • (PCS): NO
  • (Other): NO

AT&T Postpaid Porting Instructions

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.


Please contact Best Cellular customer service if you need help or can’t find what you’re looking for in our list of United States mobile virtual network operators and wireless communications service providers.