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2. 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 ...

3. 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 ...

4. AT&T CallVantage - Wikipedia

   en.wikipedia.org/wiki/AT&T_CallVantage

   AT&T CallVantage competed with other VoIP providers, such as Vonage.When AT&T U-verse Voice was unveiled January 28, 2008, AT&T continued to market CallVantage to customers without U-verse, particularly customers outside AT&T's local phone service territory.

5. How AT&T customers can protect themselves in the latest data ...

   www.aol.com/t-customers-protect-themselves...

   AT&T said Friday that data was breached from “nearly all” of its cellular customers and the customers of wireless providers that used its network between May 1, 2022, and October 31, 2022. The ...

6. Comparison of VoIP software - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_VoIP_software

   This is a comparison of voice over IP (VoIP) software used to conduct telephone-like voice conversations across Internet Protocol (IP) based networks. For residential markets, voice over IP phone service is often cheaper than traditional public switched telephone network (PSTN) service and can remove geographic restrictions to telephone numbers, e.g., have a PSTN phone number in a New York ...

7. History of videotelephony - Wikipedia

   en.wikipedia.org/wiki/History_of_videotelephony

   By 1930, AT&T's "two-way television-telephone" system was in full-scale experimental use. [7] [20] The Bell Labs' Manhattan facility devoted years of research to it during the 1930s, led by Dr. Herbert Ives along with his team of more than 200 scientists, engineers and technicians, intending to develop it for both telecommunication and broadcast entertainment purposes.