Here is how to get your AT&T Postpaid account number and transfer PIN, and what to do with them when you move your number to another carrier.
Account Number
The account number for AT&T postpaid accounts will be on the customers bill (it is NOT the phone number). For bundled accounts, the account number will be a 12-digit number under your wireless account summary.
Transfer PIN
The password will be your online password. 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.
*#06# for your IMEI and check it first.
This 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 transfer PIN.
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
- Porting Department: 1-888-898-7685
What network does AT&T Postpaid use?
AT&T Postpaid runs on the AT&T network.
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.
Check coverage before you port
AT&T Postpaid runs on the AT&T network, so the coverage you get at your address is AT&T coverage. Check it on AT&T’s own coverage map before you start the transfer.
Your right to keep the number is federal, not a carrier policy. The rule is the FCC’s: Portability: Keeping Your Phone Number When Changing Service Providers.
Working a counter? The AT&T Postpaid transfer PIN lookup puts these steps on one screen and texts them to the customer.
Where AT&T Postpaid customers usually go next
AT&T Postpaid runs on AT&T’s network, so the phone in your hand is already AT&T-compatible. These carriers will take it with no compatibility question.
H2O WirelessAT&T network, prepaid
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Questions about AT&T Postpaid
Can I keep my phone number when I leave AT&T Postpaid?
Yes. Federal number portability rules let you take a working number to a new carrier. AT&T Postpaid cannot refuse the transfer or charge you to release the number.
Should I cancel AT&T Postpaid before I port my number out?
No. Cancel first and the number is released, which ends your right to move it. Keep the AT&T Postpaid line active until the new carrier confirms the port completed.
How long does a port out from AT&T Postpaid take?
A simple wireless transfer usually completes within one business day once the new carrier submits the correct AT&T Postpaid account number and transfer PIN.
Does AT&T Postpaid run on its own towers?
No. AT&T Postpaid is a reseller riding on the AT&T network.
Cite this page
We have not recorded when these port-out details were last confirmed. Call AT&T Postpaid to verify before you rely on them.
Best Cellular. “AT&T Postpaid Account Number & PIN: Accurate 2026,” BestCellular.com. https://bestcellular.com/att-postpaid/
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Check AT&T Postpaid before you switch
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AT&T Postpaid APN settings
AT&T Postpaid runs on the AT&T network. These are the APN settings AT&T Postpaid publishes for Android.
| APN name | NXTGENPHONE |
| APN | nxtgenphone |
| MMSC | http://mmsc.mobile.att.net |
| MMS proxy | proxy.mobile.att.net |
| MMS port | 80 |
| Max message size | 600k |
| APN type | default,mms,supl,hipri |
| APN protocol | IPv4 |
| Authentication type | None |
| Bearer | Unspecified |
| MCC | 310 |
| MNC | 410 |
Other APNs AT&T Postpaid publishes
- enhancedphone for 5G-capable smartphones
Source: www.att.com · Checked 2026-09-22.
Open the full APN settings tool for AT&T Postpaid
Other carriers on the AT&T network
These brands use the same towers as AT&T Postpaid. Coverage is the same. Price, data priority when the network is busy, and customer service are not.
See which network every US carrier uses · Open the transfer PIN lookup