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  2. National Do Not Call Registry - Wikipedia

    en.wikipedia.org/wiki/National_Do_Not_Call_Registry

    Originally, phone numbers remained on the registry for a period of five years, but are now permanent because of the Do-Not-Call Improvement Act of 2007, effective February 2008. [ 4 ] Consumers may add landline or cellular numbers to the registry, [ 5 ] but FCC regulations prohibit telemarketers from calling a cellular phone number with an ...

  3. Area codes 202 and 771 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_202_and_771

    The red area is the District of Columbia, served by area codes 202 and 771. Area codes 202 and 771 are telephone area codes in the North American Numbering Plan (NANP) for Washington, D.C. Area code 202 was one of the original North American area codes established in October 1947 by AT&T .

  4. 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]

  5. Do not call list - Wikipedia

    en.wikipedia.org/wiki/Do_not_call_list

    A do not call list or do not call registry is a list of personal phone numbers that are off-limits to telemarketers in some countries. Do not call lists may also be ...

  6. List of mobile network operators in the United States

    en.wikipedia.org/wiki/List_of_mobile_network...

    Big Sky Mobile: GSM: EDGE: Unknown: 2017: Sold spectrum licenses to AT&T and T-Mobile and exited the business. [41] Blaze Wireless: GSM, UMTS: EDGE, HSPA+, LTE: Unknown: December 2019: Parent company, Pinpoint Communications, discontinued cellular service and spectrum leases through Viaero Wireless were cancelled. Blue Wireless: CDMA2000: EV-DO ...

  7. Category:Defunct telecommunications companies of the United ...

    en.wikipedia.org/wiki/Category:Defunct...

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