AT&T Corp. provides voice, video, and data communications services to businesses, consumers, and governments worldwide. It operates in two segments, Business Services and Consumer Services. The Business Services segment offers domestic and international long distance and toll-free voice services, local voice services, audio and video teleconferencing services, Web-based video conferencing services, and calling cards. Its local voice services include local voice and data telecommunications services, such as basic local exchange service, exchange access, private line, and high speed data and pay phone; integrated voice, data, and Internet protocol (IP) services; and packet services.

This segment also provides IP connectivity, managed IP, messaging, electronic commerce services and managed networking services, professional services, and outsourcing solutions; enterprise networking services; enterprise remote access services; Web services; and security services. It offers local, interstate, and international wholesale networking capacity and switched services to other service providers. The Consumer Services segment provides interstate and intrastate long distance telecommunications services throughout the continental U.S. and telecommunications services to and from Alaska, Hawaii, Puerto Rico, and the Virgin Islands, as well as international telecommunications services to and from various nations and territories worldwide.

It provides bundled local and long distance services; calling card services; transaction-based services; Internet; and residential voice over IP services. AT&T Corp. was formerly known as American Telephone & Telegraph Company and changed its name to AT&T Corp. in April 1994. The company was founded in 1885 and is based in Bedminster, New Jersey. AT&T Corp. operates as a subsidiary of AT&T Inc.