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For international access the NANP is assigned the country code 1, which is dialed as a prefix in the international E.164 telephone numbering plan. The trunk prefix for dialing long-distance calls, across numbering plan area (NPA) boundaries within Canada or to other NANP countries, is also 1 .
Country codes are defined by the International Telecommunication Union (ITU) in ITU-T standards E.123 and E.164. The prefixes enable international direct dialing (IDD). Country codes constitute the international telephone numbering plan. They are used only when dialing a telephone number in a country or world region other than the caller's.
This is a list of international dialing prefixes used in various countries for direct dialing of international telephone calls.These prefixes are typically required only when dialling from a landline, while in GSM-compliant mobile phone (cell phone) systems, the symbol + before the country code may be used irrespective of where the telephone is used at that moment; the network operator ...
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.
Numbering plan areas and area codes of New Jersey Map of numbering plan area 201/551. Area codes 201 and 551 are telephone area codes in the North American Numbering Plan (NANP) in the U.S. State of New Jersey. Area code 201 was the area code assigned to the entire state of New Jersey in 1947, when the North American area code system was formed.
The ten-digit telephone numbers of the North American Numbering Plan consist of a three-digit numbering plan area code (NPA code), written as the most-significant part of the national telephone number, followed by the three-digit central office code, and the four-digit local line or station number.
It was also the first area code assigned in the numbering plan. New Jersey numbering plan areas as shown in the July 1963 NJ Bell telephone directory, when the use of the area code became mandatory. In 1956, New Jersey was divided into two numbering plan areas, a northern area which retained the code 201, and a southern area which received the ...
Area code 973 was created on June 1, 1997, in a split of area code 201, [1] [2] which was the original area code for of all of New Jersey when the North American Numbering Plan was inaugurated for nationwide operator dialing in 1947. In 1958, the numbering plan area of 201 was cut back to the northern half of the state, and in 1991 to just the ...