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They are used only when dialing a telephone number in a country or world region other than the caller's. Country codes are dialed before the national telephone number, but require at least one additional prefix, the international call prefix which is an exit code from the national numbering plan to the international one.
This is a list of telephone dialling codes in the United Kingdom, which adopts an open telephone numbering plan for its public switched telephone network. The national telephone numbering plan is maintained by Ofcom, an independent regulator and competition authority for the UK communications industries. This list is based on the official standard, but includes defunct codes and historical ...
In the United Kingdom, the "area code" is often referred to as a " subscriber trunk dialling code" (STD code) or a "dialling code". STD codes are two, three, four or, exceptionally, five digits long (after the initial zero). Regions with shorter area codes, typically large cities, permit the allocation of more telephone numbers as the local number part has more digits. Local customer numbers ...
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, only the symbol + before the country code may be used [citation needed] irrespective of where the telephone is used at that moment; the ...
Country Code: +55. International Call Prefix: 00 then Carrier Code. Trunk Prefix: 0 then Carrier Code. This article contains a list of area codes in Brazil for telephone dialing. The area codes are distributed geographically, citing the main cities in each area. Local phone numbers in Brazil observe an eight-digit pattern (nnnn-nnnn) for ...
A call within the same city or within an area is dialed only by the subscriber number, while for calls outside the area, the telephone number must be prefixed with the destination area code. A fixed dialing plan requires to dial all digits of the complete telephone number, including any area codes.
^ The original prefix issued to the mobile network operator. Due to mobile number portability, it is possible for these mobile prefixes to be shared by different mobile operators. ^ The number of digits that allow to uniquely identify a number within the country. It excludes the country code and any trunk code or access code. It includes the mobile prefix towards the total number of digits.
In general, shorter area codes are assigned to larger cities, and longer area codes to smaller towns. Subscriber telephone numbers are usually inversely long: those in larger cities have seven or eight digits, while those in smaller towns may have as few as three or four digits.