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  2. Talk:Automatic number announcement circuit - Wikipedia

    en.wikipedia.org/wiki/Talk:Automatic_number...

    There is no non-geographic area code 200, although exchange 1-NPA-200-XXXX now exists in many local area codes (if it has not been explicitly reserved). The 1-200 area has occasionally been used as an unused space in which to place test numbers, but is rare as in most communities a 1- indicates a long-distance trunk call.

  3. List of Oklahoma area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Oklahoma_area_codes

    The state of Oklahoma is served by the following area codes: 405/572: Central Oklahoma including Oklahoma City (original area code created in 1947; 572 added as overlay on April 24, 2021 [1] [2] [3] 580: Western and southern Oklahoma (split from 405 in 1997) 539/918: Northeastern Oklahoma including Tulsa (918 created in 1953 as split from 405 ...

  4. MCI Inc. - Wikipedia

    en.wikipedia.org/wiki/MCI_Inc.

    MCI, Inc. (formerly WorldCom and MCI WorldCom) was a telecommunications company. For a time, it was the second-largest long-distance telephone company in the United States , after AT&T .

  5. List of North American Numbering Plan area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_North_American...

    2023: returned to the pool of area codes available for future area code relief; 457: Louisiana (Shreveport–Bossier City, Monroe, Alexandria, Fisher, Tallulah, and most of northern Louisiana) September 25, 2025 [3] to be overlaid on 318; previously a fictitious area code assigned to identify Naked DSL/Dry Loop and dedicated data lines in ...

  6. MCI Communications - Wikipedia

    en.wikipedia.org/wiki/MCI_Communications

    On October 28, 1968, Hyrum Rex Lee became an FCC Commissioner and MCI began a series of submissions including a proposal for a low-cost educational television network designed to show MCI as being more flexible to public needs than AT&T. [7] While MCI was performing this lobbying, the President's Task Force on Communication Policy issued a report recommending that specialized common carriers ...

  7. Category:Oklahoma City metropolitan area - Wikipedia

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

    Pages in category "Oklahoma City metropolitan area" The following 83 pages are in this category, out of 83 total. ... Arcadia, Oklahoma; Area codes 405 and 572; B ...