AT&T Inc. provides telecommunications and technology services worldwide through its Communications and Latin America segments, offering wireless connectivity via its AT&T Mobility brand including 5G networks and unlimited data plans for consumers and businesses; broadband internet through AT&T Fiber delivering multi-gig symmetrical speeds to over 27.8 million locations; business solutions encompassing networking, cloud services, cybersecurity, and IoT; FirstNet for public safety; and legacy wireline voice and data services across 22 U.S. states. The company, tracing its origins to 1885 as a subsidiary of the Bell Telephone Company founded in 1877 and headquartered at Whitacre Tower in Dallas, Texas, operates primarily in the United States with additional presence in Mexico through AT&T Mexico and limited activities in other Latin American markets. AT&T ranks as the third-largest U.S. wireless carrier by subscribers and the world's third-largest telecommunications company by revenue. In 2025, AT&T agreed to acquire substantially all of Lumen Technologies' mass markets fiber business for expansion into additional U.S. states, expected to close in the first half of 2026 subject to regulatory approval; completed the sale of its remaining 70% stake in DirecTV to TPG Capital on July 2; announced a partnership with Gigs on September 12 to enable tech firms like Klarna and Walmart to launch branded mobile services; secured $29.5 billion in new credit facilities in November to enhance liquidity; deployed mid-band spectrum acquired from EchoStar in a $23 billion deal, boosting nationwide 5G capacity and speeds by up to 80%; and plans to bring on an equity partner for its expanded fiber network post-Lumen acquisition.