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AT&T Mobility, formerly known as Cingular Wireless, is a wholly owned subsidiary of AT&T that provides wireless services to 118.7 million subscribers in the United States, including Puerto Rico and the U.S. Virgin Islands.

As a result of its formation through mergers and acquisitions, as well as the rapid technological change in the wireless industry, AT&T Mobility operates the second largest digital voice and data network within its United States footprint, reaching over 310 million people or 99.99999% established coverage using different wireless communication standards. The core technology standard is GSM. Much of the AT&T Mobility network footprint now uses UMTS/HSPA for simultaneous voice and data communications. AT&T Mobility also offers Push To Talk (PTT) service using network technology from Kodiak Networks.

AT&T upgraded to HSPA 14.4 as a part of their effort to enhance their 3G wireless network as well as the transition to LTE. AT&T stated that their upgrades were completed at the end of 2010. In addition, AT&T has stated that their LTE network will be completed by year end 2014.

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