Call 658 ... Jamaica gets additional area code, 10-digit dialling becomes mandatory May 2018". 28 August 2017. Most areas permit local calls as 1+10D except for Texas, Georgia, and some jurisdictions in Canada which require that landline callers know which numbers are local and which are toll, dialing 10D for local calls and 1+10D for all toll calls.

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The North American Numbering Plan does not set aside special non-geographic area codes exclusively for cellular phones, as is customary in some other national telephone administrations. Only one regional exception exists in area code 600 in Canada. a b c "PL-418: Introduction of NPA 721 (Sint Maarten)" (PDF). North American Numbering Plan Administration. 2011-01-05. Archived from the original (PDF) on 2012-09-07 . Retrieved 2011-08-08. Updated by: "PL-423: Updated Information - Introduction of NPA 721 (Sint Maarten)" (PDF). North American Numbering Plan Administration. 2011-07-27. Archived (PDF) from the original on 2019-01-08 . Retrieved 2011-08-08. The four-digit numbers are not implemented in some areas. The star codes (*) are for use on Touch-Tone telephones, whereas the four-digit numbers prefixed 11xx are used on rotary dial telephones which cannot dial the * symbol.This section needs additional citations for verification. Please help improve this article by adding citations to reliable sourcesin this section. Unsourced material may be challenged and removed. ( February 2014) ( Learn how and when to remove this template message) John Greene (2015-01-16). "Why Did Old Phone Numbers Start With Letters?". Mental Floss . Retrieved 2019-02-01. The Eastern Caribbean Telecommunications Authority (ECTEL) > Telecom regulations". Archived from the original on 2011-07-18 . Retrieved 2009-03-13. 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.

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The Telecommunications Act of 1996 ( 47U.S.C. §251 (b)(2)) authorizes the Federal Communications Commission (FCC) to require all local exchange carriers (LECs) to offer local number portability. [50] The FCC regulations were enacted on June 27, 1996, with changes to take effect in the one hundred largest Metropolitan Statistical Areas by October 1, 1997, and elsewhere by December 31, 1998. [51] ITU; ITU-T. "The International Public Telecommunication Numbering Plan". ITU . Retrieved 2015-07-25. The NANP exhaust analysis estimates that the existing numbering system is sufficient beyond 2049, based on the assumptions that a maximum of 674 NPAs continue to be available, and that on average 3,990 central office codes are needed per year. [44] In 1995, the North American Numbering Plan Administrator removed the requirement that the middle digit of an area code had to be either 0 or 1, implementing fully interchangeable NPA and central office codes, that had already been anticipated since the 1960s, when interchangeable central office codes were sanctioned. In 1947, AT&T completed the new design for a nationwide toll network that established the original North American area codes. The new numbering plan provided for 152 area codes, each with a capacity to serve up to 540 central offices. [26] Originally, only eighty-six area codes were assigned. New Jersey received the first NPA code in the new system, area code 201. [27] The second area code, 202, was assigned to the District of Columbia. The allocation of area codes was readjusted as early as 1948 to account for inadequacies in some metropolitan areas. For example, the Indiana numbering plan area 317 was divided to provide a larger numbering pool in the Indiana suburbs of Chicago ( area code 219).The initial plan for area code overlays did allow for providing separate area codes for use by mobile devices, although these were still assigned to a specific geographical area, and were charged at the same rate as other area codes. Initially, the area code 917 for New York City was specifically assigned for this purpose within the boroughs; however, a Federal court overturned the practice and the use of an area code for a specific telephony purpose. [ citation needed] Since mobile telephony has been expanding faster than landline use, new area codes typically have a disproportionately large fraction of mobile and nomadic numbers, although landline and other services rapidly follow and local network portability can blur these distinctions. and 1171 — three-way calling, which lets a person talk to people in two different locations at the same time The toll-free telephone numbers in NPA 800, 888, 877, 866, 855, 844, and 833 have been portable through the RespOrg system since 1993. [54] Toll charges [ edit ] Alliance for Telecommunications Industry Solutions (ATIS), Numbering and Dialing Plans within the United States (ATIS-0300076), December 2008, p.7 The status of the network of the 1960s was reflected in a new name used in technical documentation: North American Integrated Network. [7] By 1975, the numbering plan was referred to as the North American Numbering Plan, [8] leading to the well-known acronym NANP, as other countries sought or considered joining in the standardization.

The North American Numbering Plan (NANP) - VoIP-Info

Depending on the techniques used for area code and central office code relief, the effect on telephone users varies. In areas in which overlays were used, this generally avoids the need for converting telephone numbers, so existing directories, business records, letterheads, business cards, advertising, and "speed-dialing" settings can retain the same phone numbers, while the overlay is used for new number allocations. The primary impact on telephone users is the necessity of remembering and dialing ten-digit numbers when only seven-digit dialing was previously needed.NANP telephone numbers are usually written as NPA-NXX-XXXX or (NPA) NXX-XXXX . For example, 250 555 0199, a fictional number, could be written as 250-555-0199, (250) 555-0199, 250-5550199, or 250/555-0199. The parentheses were originally used to indicate that the area code was not necessary for local dialing. The Government of Canada's Translation Bureau recommends using hyphens between groups; e.g. 250-555-0199. [40]

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All-number calling was a telephone numbering plan introduced in 1958, [33] that converted telephone numbers with exchange names to a numeric representation of seven digits. In the following decades, the NANP expanded to include all of the United States and its territories, Canada, Bermuda, and seventeen nations of the Caribbean. [9] [10] NANPA: North American Numbering Plan Administration - About Us". Archived from the original on 2012-06-04 . Retrieved 2011-11-05. Unlike many countries calls between the majority of local stations in the United States and Canada are toll-free, with only long distance calls incurring a toll charge. The requirement for prefixing a leading 1 to place a toll call is known as requiring toll alerting. The need for toll alerting varies from NPA to NPA however it is universally active in Canada and implemented for many other jurisdictions in the NANP. 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.Each three-digit area code has a capacity of 7,919,900 telephone numbers (7,918,900 in the United States).