What kind of company is AT&T? What Mobile network is AT&T?

AT&T, which stands for American Telephone and Telegraph Company, is an American multinational telecommunications holding company. It is one of the largest telecommunications companies in the world and is headquartered at Whitacre Tower in Downtown Dallas, Texas.

AT&T is the world’s fourth-largest telecommunications company by revenue and the largest wireless carrier in the United States. As of 2023, AT&T was ranked 13th on the Fortune 500 rankings of the largest United States corporations, with revenues of $120.7 billion.

AT&T began its history as the American District Telegraph Company, formed in St. Louis in 1878. After expanding services to Arkansas, Kansas, Oklahoma, and Texas through a series of mergers, it became Southwestern Bell Telephone Company in 1920, which was then a subsidiary of American Telephone and Telegraph Company.

The latter was a successor of the original Bell Telephone Company founded by Alexander Graham Bell in 1877. The American Bell Telephone Company formed the American Telephone and Telegraph Company (AT&T) subsidiary in 1885. In 1899, AT&T became the parent company after the American Bell Telephone Company sold its assets to its subsidiary.

AT&T provides wireless services in the United States. It is a wholly-owned subsidiary of AT&T Inc. and is the largest wireless carrier in the United States, with 241.5 million subscribers as of December 31, 2023. AT&T Mobility, also known as AT&T Wireless and marketed as simply AT&T, is an American telecommunications company. It provides mobile telephony and wireless broadband products and services.

AT&T uses the GSM network, which stands for Global System for Mobile Communications. GSM is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe the protocols for second-generation (2G) digital cellular networks used by mobile devices such as mobile phones and tablets. It was first deployed in Finland in December 1991. As of 2014, it has become the global standard for mobile communications – with over 90% market share, operating in over 193 countries and territories.

AT&T also operates on 3G, 4G, and 5G networks. 3G stands for third-generation wireless mobile telecommunications technology. It is the upgrade for 2G and 2.5G GPRS networks, for faster data transfer speed. 4G is the fourth generation of broadband cellular network technology, succeeding 3G, and preceding 5G.

A 4G system must provide capabilities defined by ITU in IMT Advanced. 5G is the fifth generation technology standard for broadband cellular networks, which cellular phone companies began deploying worldwide in 2019, and is the planned successor to the 4G networks which provide connectivity to most current cellphones.

In conclusion, AT&T is a leading telecommunications company that provides a wide range of services including mobile telephony and wireless broadband. It operates on GSM, 3G, 4G, and 5G networks, providing extensive coverage and high-speed connectivity to its customers.