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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.
[citation needed] The 06 and 09 area codes are unused. In addition, each other area code has large number ranges unallocated. [citation needed] When dialling from outside Australia, after dialling the appropriate international access code, it is necessary to dial the country code for Australia (61) followed by the nine digit national ...
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 ...
It is a closed telephone numbering plan in which all subscriber telephone numbers have seven digits, in addition to the three-digit area code. Under all-number calling, a numbering plan introduced around 1960, local calls within an area code were placed by dialing NXX-XXXX, omitting the area code, known as seven-digit dialing.
The length of codes varied; as early as 1971, some localities had area codes as long as seven digits, while the state capitals had two-digit area codes. By 1989, the system had been standardised to three-digit codes across the board, with two digit codes in the major cities. Only Kangaroo Island retained its four-digit code. [1]
When dialing a telephone number, the area code may have to be preceded by a trunk prefix or national access code for domestic calls, and for international calls by the international access code and country code. Area codes are often quoted by including the national access code. For example, a number in London may be listed as 020 7946 0321.
This code specifies that the entire number should be 15 digits or shorter, and begin with an international calling prefix and a country prefix. For most countries, this is followed by an area code, city code or service number code and the subscriber number, which might consist of the code for a particular telephone exchange.
A caller from outside Australia must dial the international call prefix of the originating country and the country code (61 for Australia), then the area code (7), and then the local subscriber number. Therefore, a caller in the UK must dial 00 61 7 3333 3333, while a caller in the US must dial 011 61 7 3333 3333. Calling inter-area (within ...