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In North America, the area served by the North American Numbering Plan (NANP) system of area codes, fictitious telephone numbers are usually of the form (XXX) 555-xxxx. The use of 555 numbers in fiction, however, led a desire to assign some of them in the real world, and some of them are no longer suitable for use in fiction.
Random number generation is a process by which, often by means of a random number generator (RNG), a sequence of numbers or symbols that cannot be reasonably predicted better than by random chance is generated. This means that the particular outcome sequence will contain some patterns detectable in hindsight but impossible to foresee.
Telephone numbers in the Netherlands are administered by the Ministry of Economic Affairs, Agriculture and Innovation of the Netherlands. The telephone numbering plan may be grouped into three general categories: geographical numbers, non-geographical numbers, and numbers for public services.
Telephone numbers in Canada follow the fixed-length format of the North American Numbering Plan (NANP) of a three-digit area code, a three-digit central office code (or exchange code), and a four-digit station or line code. This is represented as NPA NXX XXXX.
Telephone numbers in Nigeria use an open numbering plan. They are composed of a combination of an area code and a local line or subscriber telephone number. Area codes consist of one digit ( Lagos, Ibadan and Abuja) or two digits.
Local numbers usually begin with a 4, although in recent times numbers having 2, 3, 5, 6, or even 7 and 8 as the first digit are not uncommon. Thus, for example to call a local number within Buenos Aires, one should dial 1234–5678; within Mar del Plata, 123-4567 and within Villa Carlos Paz, 12–3456.
List of Germany dialing codes. The regulation of telephone numbers in Germany is the responsibility of the Federal Network Agency ( German: Bundesnetzagentur, BNetzA) of the German government. The agency has a mandate to telecommunications in Germany and other infrastructure systems.
Telephone numbers in Japan consist of an area code, an exchange number, and a subscriber number.
International call out: 00N (where N is the carrier code) followed by the distant country code and telephone number. Calling into Korea: +82 XX XXXX YYYY. The leading "0" is dropped when dialling into South Korea from abroad. Some 1566/1577/1588 telephone numbers cannot be dialed from abroad.
The telephone number prefix 555 is a central office code in the North American Numbering Plan, used as the leading part of a group of 10,000 telephone numbers, 555-XXXX, in each numbering plan area (NPA) (area code).