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The new numbering plan divided the North American continent into regional service areas, called numbering plan areas ( NPAs). The divisions primarily followed the jurisdictional boundaries of the U.S. states and the Canadian provinces. [22] Some states or provinces needed to be divided into multiple areas. NPAs were created in accordance with principles deemed to maximize customer understanding and minimize dialing effort, while reducing plant cost. [23] Each NPA was identified by a unique three-digit code number, called the numbering plan area code, which was prefixed to the local telephone number when calling from one NPA to another. Calling within the same numbering plan area did not require dialing the area code. Improving which areas, you will want in the NXX Headquarters will be up to your personal preference. In the long run, you will be able to max out all room levels so it’s entirely up to your decision how you will want to play your game. 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. Not all NANP countries use the same codes. For example, the emergency telephone number is not always 911: Trinidad and Tobago and Dominica use 999, as in the United Kingdom. The country of Barbados uses 211 for police force, 311 for fire, and 511 for ambulance, while Jamaica uses 114 for directory assistance, 119 for police force, and 110 for fire and ambulance services.

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) local utility location services (United States), non-urgent telehealth/teletriage services in Canada (formerly telephone company business office) The US phone number format is based on the North American Numbering Plan. Canada and the other nations in the region of North America and the Caribbean also use this format.

Mehta, Stephanie N. (1999-02-26). "The Kennedy Space Center Acquires a New Area Code: 3-2-1, as in Blast Off". The Wall Street Journal. When you see a US phone number ( 323 ) 555-1234 , which is represented in international phone format as +1 ( 323 ) 555-1234 . 1. Country CodeOf all states or territories, the U.S. state of California has the largest number of area codes assigned, followed by Texas, Florida and New York, while most countries of the Caribbean use only one. [57] Many Caribbean codes were assigned based on alphabetic abbreviations of the territory name, as indicated in the third column of the following table ( Letter code). This follows the traditional letter assignments on telephone dials. For some Pacific islands, the NANPA area code is the same as the country code that was discontinued upon membership in the NANP. 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. NANPA: North American Numbering Plan Administration - About Us". Archived from the original on 2012-06-04 . Retrieved 2011-11-05.

Using the global formatting for telephone numbers, per recommendation E.164 by the International Telecommunication Union (ITU), a NANP number is written as +1NPANXXXXXX, without spaces or punctuation, e.g. +12505550199. The plus sign indicates that the user may have to dial another prefix per local dialing conventions in the country of origin that selects a trunk for international network access; the digits immediately following are thus the country code, where 1 is the NANP country code. FCC Designates 988 for the National Suicide Prevention Lifeline". Federal Communications Commission. 2020-07-16 . Retrieved 2021-12-06. The number of digits dialed is unrelated to being a local call or a toll call when there is no toll alerting. Allowing 7D local dial across an area code boundary, which is uncommon today, requires central office code protection, locally if using toll alerting, across the entire area code otherwise, to avoid assignment of the same seven-digit number on both sides. Landlines occasionally require 1+10D where 10D is required, most notably in California.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. The North American Numbering Plan ( NANP) is a telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1 and has the telephone country code 1. Some North American countries, most notably Mexico, do not participate in the NANP.