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  1. Telephone numbers in Europe are managed by the national telecommunications authorities of each country. Most country codes start with 3 and 4, but some countries that by the Copenhagen criteria are considered part of Europe have country codes starting on numbers most common outside of Europe (e.g. Faroe Islands of Denmark have a code ...

  2. Country calling codes, country dial-in codes, international subscriber dialing (ISD) codes, or most commonly, telephone country codes are telephone number prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks.

    Serving
    Code
    Time (utc ±)(zone)
    Abkhazia
    +03:00
    Afghanistan
    +04:30
    Åland
    +02:00
    Albania
    +01:00
  3. Telephone numbers are of variable length. Local numbers are supported from landlines. Numbers can be dialled with a '0'-lead prefix that denotes either a geographical region or another service. Mobile phone numbers have distinct prefixes that are not geographic, and are portable between providers.

  4. French people usually state phone numbers as a sequence of five double-digit numbers, e.g., 0x xx xx xx xx (and not, for example, 0 xxx-xxx-xxx or 0xxx-xx-xxxx or 0xx-xxx-xxxx). Overseas departments and collectivities have separate country codes and different number formats.

  5. A telephone number serves as an address for switching telephone calls using a system of destination code routing. Telephone numbers are entered or dialed by a calling party on the originating telephone set, which transmits the sequence of digits in the process of signaling to a telephone exchange.

  6. Telephone numbers in Portugal. Portugal changed to a closed telephone numbering plan on 31 October 1999; previously, the trunk prefix was '0', but this was dropped. [1] For landline subscribers, the area code, prefixed by the digit '2', was incorporated into the subscriber's number.

  7. Germany has an open telephone numbering plan. Before 2010, area codes and subscriber telephone numbers had no fixed size, meaning that some subscriber numbers may be as short as two digits.