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Area codes 615 and 629 are area codes in Tennessee serving Nashville (Davidson County) and the 12 surrounding counties. 615 is the main area code, while 629 is an overlay covering the same area that began service in 2014. Besides Nashville, Murfreesboro, Franklin, Gallatin, Hendersonville, and Lebanon are other major cities in the 615/629 service territory. ==History== When area codes were introduced in October 1947, Tennessee's only area code was 901. During 1954, in a flash-cut, most of the state east of the Tennessee River's western bend was assigned 615, while 901 was restricted to Memphis and the western third of the state. This configuration remained in place for over 41 years. In September 1995, most of the eastern portion of 615—including Chattanooga, Knoxville, and the Tri-Cities—was assigned area code 423. As a result, the state's three area codes were roughly coextensive with the traditional Grand Divisions of Tennessee; 423 served almost all of East Tennessee, 615 served Middle Tennessee, and 901 served West Tennessee. Although this was intended to be a long-term solution, within a year 615 was nearing exhaustion due to the rapid growth of the Nashville area, as well as the proliferation of cell phones and pagers. This forced yet another split in September 1997; the 615 area was reduced to its current size, while most of the western, southern, and eastern portions of the old 615 territory—including Clarksville, Cookeville, Columbia, and Tullahoma—was split off as area code 931, which now almost entirely surrounds 615. This made 615 largely coextensive with the inner ring of the Nashville metropolitan area. In 1999, the North American Numbering Plan Administrator (NANPA) informed the Tennessee Regulatory Authority (TRA) that the available telephone numbers in the 615 area code would be exhausted by the fourth quarter of 2000.〔(Request to All Affected Telecommunications Service Providers and Cooperatives in Tennessee to Take Voluntary Area Code Conservation Measures, Docket 99-00784 ), Tennessee Regulatory Authority, October 15, 1999.〕 The TRA and telecommunications providers implemented several number conservation measures〔 that succeeded in averting the predicted crisis. In 2003 the NANPA notified the TRA that the area code was not projected to exhaust its supply of numbers for at least five years.〔(Neustar, Inc. letter to Sara Kyle, RE: Docket 99-00784 ), June 17, 2003.〕 As of March 2012 it was estimated that it would exhaust in the second quarter of 2015, by which time an additional split or an overlay might be necessary.〔http://www.nanpa.com/pdf/NRUF/2010_NPA_Exhaust_Projections.pdf〕 An overlay of 615 - which would be Tennessee's first overlay - has been recommended.〔(NOWG-NANPA Meeting Minutes ), Neustar, November 15, 2010.〕〔(Tennessee Regulatory Authority Docket 1100018: NeuStar, Inc., in its role as North American Numbering Plan Administrator Petition for Approval of Numbering Plan Area Relief Plan for the 615 NPA ), January 31, 2011〕 The overlay code, 629, was approved on 21 October 2013. Permissive dialing began on 26 July 2014, during which it was possible to make calls with either seven or ten digits (the latter ''with'' the area code). Ten-digit dialing has been required in the 615/629 area since 28 February 2015.〔http://www.newschannel5.com/story/23751073/new-area-code-for-new-numbers-in-middle-tennessee〕〔http://www.tn.gov/tra/orders/2011/1100018l.pdf〕〔http://www.state.tn.us/tra/pressr/2013/615AreaCodeDecision.pdf〕 Nashville was one of the largest cities where seven-digit dialing was still possible. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Area codes 615 and 629」の詳細全文を読む スポンサード リンク
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