AT&T Mobility (commonly known as AT&T) is a mobile network operator in United States assigned PLMN code 311-090 by the national telecommunications authority.

The MCC 311 identifies United States, while MNC 090 uniquely identifies this operator within the country. Together they form the PLMN (Public Land Mobile Network) identifier used by mobile devices for network selection, SIM card identification, and international roaming.

This assignment was last reported in ITU Operational Bulletin #1280 (Nov. 15, 2023). Search all MCC/MNC codes or view all United States operators .