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Worldwide distribution of country calling codes. Regions are coloured by first digit. Telephone country codes, but also sometimes referred to as "country dial-in codes", or historically "international subscriber dialing" (ISD) codes in the U.K., are telephone number dialing prefixes for reaching subscribers in foreign countries or areas via international telecommunication networks.
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 ...
Users can switch carriers while keeping number and prefix (so prefixes are not tightly coupled to a specific carrier). 7 Claro 8: Instituto Costarricense de Electricidad (Kölbi) Croatia +385: 91: 9: A1 Hrvatska: Due to Mobile number portability the prefix of an existing number does not determine the carrier. Any new number will follow the ...
Country name Country Code International Call Prefix Main article Abkhazia +995 44, +7 840, +7 940 — Telephone numbers in Abkhazia Christmas Island +61 8 9164 — Telephone numbers in Christmas Island
For other devices the user must replace the + with the international access code for their current location. In the United States, most carriers require the caller to dial 011 before the destination country code. [9] New Zealand requires the area code to be dialed when calling between two local calling areas. During the 1970s and 1980s, each ...
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. In other countries, both the prefix and the number may have ...
Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC). NPAs with 9 in the second position are reserved for future format expansion.
In the mid-1980s, the 4A crossbar was replaced with a digital switch which took up part of a single floor and quadrupled calling capacity. The 408 area code was the last area code in the United States to institute the requirement of dialing "1" before making a long-distance call. [citation needed]