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An N11 code (pronounced Enn-one-one) is a three-digit dialing code used in abbreviated dialing in the North American Numbering Plan (NANP). The mnemonic N stands for the digits 2 through 9 and thus the syntax stands for the codes 211, 311, 411, 511, 611, 711, 811, and 911.
The dialing procedures (dialing plan) in some areas permit dialing numbers in the local calling area without using an area code or city code prefix. For example, a telephone number in North America consists of a three-digit area code, a three-digit central office code, and four digits for the line number.
Each NPA was identified by a unique three-digit code number, termed 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.
A telephone prefix is the first set of digits after the country, and area codes of a telephone number. In the North American Numbering Plan countries (country code 1), it is the first three digits of a seven-digit local phone number, the second three digits of the 3-3-4 scheme.
They can consist of a two-digit (NN) area code and an eight-digit local number (ABCD XXXX) or a three-digit area code (NNN) with a seven-digit local number (ABC XXXX). As of August 3, 2019 all the indicators and access codes (01, 044, 045) are deprecated, therefore all telephone numbers, for landline or mobile service, are dialed with ten digits.
NANP members are assigned three-digit numbering plan area (NPA) codes under the common country prefix 1, shown in the format 1 (NPA) . 1 North American Numbering Plan. 1 – United States, including United States territories: 1 (340) – United States Virgin Islands. 1 (670) – Northern Mariana Islands. 1 (671) – Guam.
5-1-1 is a transportation and traffic information telephone hotline in some regions of the United States and Canada. Travelers can dial 511, a three-digit telephone number, on landlines and most mobile phones.
Each NPA is identified by one or more numbering plan area codes (NPA codes, or area codes), consisting of three digits that are prefixed to each local telephone number having seven digits. A numbering plan area with multiple area codes is called an overlay. Area codes are also assigned for non-geographic purposes.
311 is a special telephone number supported in many communities in Canada and the United States. The number provides access to non-emergency municipal services. The number format follows the N11 code for a group of short, special-purpose local numbers as designated in the North American Numbering Plan . The telephone number 3-1-1 creates a ...
Several NANP codes; see Telephone numbers in Canada. Caribbean Netherlands: Caribbean 599-3, 4, or 7: 00 Cayman Islands: Caribbean 1-345: 011 1 Chile: South 56: 00 Colombia: South 57: 00 0 Trunk followed by 1 or 3 digit carrier code Costa Rica: Central 506: 00 Cuba: Caribbean 53: 00 Curaçao: Caribbean 599-9: 00 Dominica: Caribbean 1-767: 011 1 ...