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2. Telephone exchange names - Wikipedia

   en.wikipedia.org/wiki/Telephone_exchange_names

   Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]

3. Mobile network codes in ITU region 3xx (North America)

   en.wikipedia.org/wiki/Mobile_network_codes_in...

   AT&T: AT&T Mexico: Not operational: iDEN 800: Former Nextel; shut down 2017: 334: 020: Telcel: América Móvil: Operational: UMTS 850 / UMTS 1900 / LTE 850 / LTE 1700 / LTE 2600 / 5G 3500: former Radiomóvil Dipsa; GSM shut down Sep 2020: 334: 030: Movistar: Telefónica: Operational: MVNO: former Pegaso PCS; MVNO on AT&T, own spectrum returned ...

4. AT&T - Wikipedia

   en.wikipedia.org/wiki/AT&T

   AT&T Inc.is an American multinational telecommunicationsholding company headquartered at Whitacre Towerin Downtown Dallas, Texas.[4] It is the world's third-largest telecommunications company by revenueand the second-largest wireless carrier in the United Statesbehind Verizonbut ahead of T-Mobile.[5] As of 2023, AT&T was ranked 13th on the ...

5. History of AT&T - Wikipedia

   en.wikipedia.org/wiki/History_of_AT&T

   History of AT&T. The history of AT&T dates back to the invention of the telephone. The Bell Telephone Company was established in 1877 by Alexander Graham Bell, who obtained the first US patent for the telephone, and his father-in-law, Gardiner Greene Hubbard. Bell and Hubbard also established American Telephone and Telegraph Company in 1885 ...

6. AT&T Mobility - Wikipedia

   en.wikipedia.org/wiki/AT&T_Mobility

   AT&T Mobility, LLC, also known as AT&T Wireless and marketed as simply AT&T, is an American telecommunications company. It is a wholly owned subsidiary of AT&T Inc. and provides wireless services in the United States. AT&T Mobility is the second largest wireless carrier in the United States, with 114.5 million subscribers as of March 31, 2024.

7. Breakup of the Bell System - Wikipedia

   en.wikipedia.org/wiki/Breakup_of_the_Bell_System

   The breakup of the Bell System resulted in the creation of seven independent companies that were formed from the original twenty-two AT&T-controlled members of the System. [5] On January 1, 1984, these companies were NYNEX, Pacific Telesis, Ameritech, Bell Atlantic, Southwestern Bell Corporation, BellSouth, and US West. NYNEX, merged with Bell ...