This American Telephone and Telegraph Company known as AT&T was founded by SBC purpose of providing voice, video data, and internet services. Bell, the world’s largest telecommunications business, was founded in 1876. att my results It includes small businesses and provides several services in the United States and Canada. A developer of media, technology, and telecommunications services is AT&T Inc (AT&T). The company offers wireless connections, data/broadband and internet services, local and long-distance telephone services, communication devices, controlled networking, and retail services.