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Requiring 1 to be dialed before the full number in some areas provided for area codes of the form N10, such as 210 in the San Antonio, Texas, area and 410 in eastern Maryland. Therefore, someone calling from San Jose, California, to Los Angeles before the change would have dialed 213-555-0123 and after the change 1-213-555-0123, which permitted the use of 213 as an exchange prefix in the San Jose area. The preceding 1 also ideally indicates a toll call; however, this is inconsistent across the NANP because the FCC has left it to the U.S. state public utilities commissions to regulate for traditional landlines, and it has since become moot for mobile phones and digital VoIP services that now offer nationwide calling without the extra digit. [ citation needed] Interchangeable NPA codes [ edit ] The NANP numbering format may be summarized in the ten-digit notation NXX NXX-XXXX, where N denotes any of the digits 2–9, and X denotes any digit 0–9. Canada and the United States have experienced rapid growth in the number of area codes, particularly between 1990 and 2005. The widespread adoption of fax, modem, and mobile phone communication, as well as the deregulation of local telecommunication services in the United States in the mid-1990s, increased the demand for telephone numbers.

NXX - What does NXX stand for? The Free Dictionary NXX - What does NXX stand for? The Free Dictionary

In October 1947, AT&T published a new nationwide numbering plan in coordination with the independent telephone operators. The plan divided most of North America into eighty-six numbering plan areas (NPAs). Each NPA was assigned a unique three-digit code, typically called NPA code or simply area code. These codes were first used in Operator Toll Dialing by long-distance operators in establishing calls via trunks between toll offices. The goal of automatic service required additional technical advancements in the latest generation of toll-switching systems, completed by the early 1950s, and installation of new toll-switching systems in most numbering plan areas. The first customer-dialed direct call using an area code was made on November 10, 1951, from Englewood, New Jersey, to Alameda, California. [6] Direct distance dialing (DDD) was subsequently introduced across the country. By the early 1960s, DDD had become commonplace in cities and most towns in the United States and Canada. By 1967, the number of assigned area codes had grown to 129. [7] FCC Designates 988 for the National Suicide Prevention Lifeline". Federal Communications Commission. 2020-07-16 . Retrieved 2021-12-06. Mapquest will generate a map show the approximate Central Office location if you invoke it with a URL like this:In NPAs that do not require overlay facilities numbers of the form NXX-XXXX are colloquially referred to as local and numbers of the form 1-NPA-NXX-XXXX are known as long distance. In certain NPAs, particularly large urban areas, the maximum number of available NXX and Station code combinations has been reached, requiring additional non-toll NPA’s to be assigned – these are known as overlay facilities and their presence is generally reflected by ‘local’ numbers taking on the form NPA-NXX-XXXX and ‘long distance’ the form 1-NPA-NXX-XXXX. The NANPA maintains historical assignments statistics on Station and Exchange code use within each NPA and periodically issues exhaustion projections (eg. http://www.nanpa.com/pdf/NRUF/2006-2NPA_Exhaust_Projections.pdf) which are used to advertise and plan network structure changes.

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The use of telephone exchange names as part of telephone numbers had been a well-established practice, and this was preserved for convenience and expediency in the new network design. The letter-to-digit translations were printed on the face of every rotary dial in the metropolitan areas, according to a scheme designed by W.G. Blauvelt in 1917, that had been used in the Bell System in large metropolitan areas since the early 1920s. [29] The network reorganization standardized this system to using a two-letter, five-digit ( 2L-5N) representation of telephone numbers in most exchanges in North America, [30] or to using an equivalent all-numeric seven-digit numbering plans, as was practiced by some telephone companies. It was already common practice for decades that the digits 0 and 1 could not appear in the first two digits of the central office codes, because the system of using the first two letters of familiar names for central offices did not assign letters to these digits. The digit 0 was used for operator assistance, and 1, which is essentially a single pulse of loop interruption, was automatically ignored by most switching equipment of the time. [22] Therefore, the 0/1 rule for the area code provided a convenient means to distinguish seven-digit dialing from ten-digit dialing. local utility location services (United States), non-urgent telehealth/teletriage services in Canada (formerly telephone company business office) International Direct Distance Dialing (IDDD) for the territories of the North American Numbering Plan in March 1970. [48]

Operator Toll Dialing required a nationwide telephone numbering plan that unified all local numbering plans into a consistent universal system. Local numbering plans, many of which required only four or five digits to be dialed, or even fewer in small communities, needed to be expanded. but the goal was to enable local telephone companies to make as few changes as possible in their systems. The Dutch Caribbean territory of Sint Maarten joined the NANP in September 2011, receiving area code 721. [13] Sint Maarten shares the island with the French Collectivity of Saint Martin which, like the rest of the French Caribbean, is not part of the NANP. Initially, states divided into multiple numbering plan areas were assigned area codes with the digit 1 in the second position, while areas that comprised entire states or provinces received codes with 0 as the middle digit. This rule was broken by the early 1950s, [22] as NPAs with digit 0 in the middle had to be split, but until 1995 all area codes assigned had none other than the digits 0 and 1 in this position. For example, 234 235-5678 is a valid telephone number; with area code 234, central office prefix (exchange) 235, and line number 5678. The number 234 911-5678 is invalid, because the central office code must not be in the form N11. 314 159-2653 is invalid, because the office code must not begin with 1. 123 234-5678 is invalid, because the NPA must not begin with 0 or 1. [36] [37] [38] [39] The Glenn Miller tune PEnnsylvania 6-5000 refers to telephone number PE6-5000, a number in service at the Hotel Pennsylvania (212 736-5000) in New York City until the hotel's closing in 2020. Similarly, the classic film BUtterfield 8 is set in the East Side of Manhattan between roughly 64th and 86th Streets, where the telephone prefixes include 288.