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List of area code overlays : ウィキペディア英語版 | List of area code overlays __NOTOC__ An area code overlay is a North American area code which is located in the same geographic location as at least one other area code. They are determined and regulated as part of the North American Numbering Plan to increase the number of available phone numbers in a province, state or region.〔Haar, Dan and Vanessa Hua. ("Regulators Have Area Code Plan" ). ''The Courant''. August 18, 1999. Accessed October 28, 2005.〕 ==List of area code overlays==
There has been a flood of new North American area codes since 1995,〔http://www.nanpa.com/enas/npaSince1995Report.do〕 much of it driven by fragmentation of numbering resources as a growing array of competitive local exchange carriers each obtain huge blocks of numbers in each rate centre in which they intend to offer new service. The North American Numbering Plan Administration maintains the definitive list of overlay plans of current and proposed area codes and overlays in the United States.〔(NANPA : Number Resources - NPA (Area) Codes )〕
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