AT&T is the industry-leading provider of wireline voice communications services in the US. The company provides telephone as well as internet access to customers in 22 states; key markets include California, Illinois, and Texas. It is also a top provider of IP-voice and digital video services. AT&T provides services internationally through its subsidiaries and affliates. The company serves corporate and government clients with an extensive range of data, managed network, and wholesale services. AT&T is the nation's second largest wireless carrier by both sales and subscriptions (after Verizon Wireless) through subsidiary AT&T Mobility, which provides mobile voice and data services to about 77 million subscribers.
