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  2. Seven-digit dialing - Wikipedia

    en.wikipedia.org/wiki/Seven-digit_dialing

    Seven-digit dialing. Seven-digit dialing is a telephone dialing procedure customary in some territories of the North American Numbering Plan (NANP) for dialing telephone numbers in the same numbering plan area (NPA). NANP telephone numbers consist of ten digits, of which the leading three are the area code.

  3. Telephone numbers in the Americas - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_the...

    Telephone numbers in the Americas. All countries in the Americas use codes that start with "5", with the exception of the countries of the North American Numbering Plan, such as Canada and the United States, which use country code 1, and Greenland and Aruba with country codes starting with the digit "2", which mostly is used by countries in ...

  4. Telephone numbers in Norway - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Norway

    Before 1993, telephone numbers would consist either of a two-digit area code and a six-digit subscriber number in cities and large towns, for example, (02) 412702 in Oslo, or a three-digit area code and a five-digit subscriber number in smaller towns, for example, (034) 83000 in Larvik.

  5. Social Security number - Wikipedia

    en.wikipedia.org/wiki/Social_Security_number

    In the United States, a Social Security number ( SSN) is a nine-digit number issued to U.S. citizens, permanent residents, and temporary (working) residents under section 205 (c) (2) of the Social Security Act, codified as 42 U.S.C. § 405 (c) (2). The number is issued to an individual by the Social Security Administration, an independent ...

  6. Former Australian dialling codes - Wikipedia

    en.wikipedia.org/wiki/Former_Australian_dialling...

    When phone numbers were changed to 8 digits these two regions became (02) 64xxxxxx numbers. Kangaroo Island was the only area in Australia that wasn't integrated into a larger area code before the change to eight-digit phone numbering, and had the only four-digit area code, (0848).

  7. Telephone numbers in Costa Rica - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Costa...

    History of allocations. Prefix 00 was reserved for international calls, while prefix 9 was assigned to special numbers, such as 911. Toll-free numbers start with 800 followed by 7 digits while premium-rate numbers start with 900 followed by 7 digits. Before 1994, all phone numbers in Costa Rica were six digits long

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