AT&T — mobile carrier in United States
AT&T operates a mobile network in United States. Every SIM on that network broadcasts a pair of numeric identifiers — a Mobile Country Code (MCC) and a Mobile Network Code (MNC) — that together tell any phone or telecom system which operator and which country a subscriber belongs to.
Operator: AT&T Wireless · Status: Operational · United States
MCC / MNC codes
| MCC | MNC | Status | Network bands |
|---|---|---|---|
| 310 | 410 | Operational | GSM, UMTS, LTE, NR |
What does an MCC/MNC identify?
The Mobile Country Code (MCC) identifies the country a subscriber's home network is registered in, and the Mobile Network Code (MNC) identifies the specific operator within that country. Together they form the PLMN identifier at the start of every IMSI stored on a SIM. Networks use this pair to route calls and messages, to recognise roaming subscribers, and to bill traffic to the right operator.
MCC/MNC, HLR lookup and number portability
An MCC/MNC tells you which network a number was originally issued on, but not where it lives today — number portability lets a subscriber keep their number when they switch operators. An HLR (Home Location Register) lookup queries the live network to return the current MCC/MNC, so you learn the real carrier serving a number rather than the one that first assigned it. That is how you confirm a number is genuinely on AT&T today, catch ported numbers, and filter out inactive or invalid lines before you call or message them.
Frequently asked questions
What is AT&T's MCC/MNC?
AT&T's primary MCC/MNC is 310/410. Larger operators run several MNCs under one MCC; the full list of AT&T's codes is in the table above.
What bands does AT&T use?
AT&T operates on GSM, UMTS, LTE, NR. Exact frequency bands vary by region and are refarmed over time as older technologies are retired.
How do I check if a number is on AT&T?
Run the number through a free HLR / carrier lookup. It queries the live network and returns the current MCC/MNC, so you can confirm the number is active and served by AT&T today — even if it was ported from another operator.