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2. 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 ...

3. Refurbishment (electronics) - Wikipedia

   en.wikipedia.org/wiki/Refurbishment_(electronics)

   Refurbishment (electronics) In electronics, refurbishment is the practice of restoring and testing a pre-owned electronic device so that it can be re-sold. Refurbished electronics are therefore pre-owned electronic devices (usually smartphones, tablets, or laptops ), that have been tested by a reseller to confirm that they are fully working.

4. History of mobile phones - Wikipedia

   en.wikipedia.org/wiki/History_of_mobile_phones

   The history of mobile phones covers mobile communication devices that connect wirelessly to the public switched telephone network. While the transmission of speech by signal has a long history, the first devices that were wireless, mobile, and also capable of connecting to the standard telephone network are much more recent.

5. 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 States.[5] As of 2023, AT&T was ranked 13th on the Fortune500rankings of the largest ...

6. Cellular frequencies - Wikipedia

   en.wikipedia.org/wiki/Cellular_frequencies

   Cellular frequencies. Cellular frequencies are the sets of frequency ranges within the ultra high frequency band that have been assigned for cellular-compatible mobile devices, such as mobile phones, to connect to cellular networks. [1] Most mobile networks worldwide use portions of the radio frequency spectrum, allocated to the mobile service ...

7. 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.