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  1. Denmark generally uses an eight-digit closed telephone numbering plan. Subscriber numbers are portable with respect to provider and geography, i.e. fixed line numbers can be ported to any physical address in Denmark.

  2. Denmark generally uses an eight-digit closed telephone numbering plan. Subscriber numbers are portable with respect to provider and geography, i.e. fixed line numbers can be ported to any physical address in Denmark.

  3. Mobile phones use geographic area codes (two digits): after that, all numbers assigned to mobile service have nine digits, starting with 6, 7, 8 or 9 (example: 55 15 99999–9999). 90 is not possible, because collect calls start with this number.

    Country Or Territory
    Interna- Tional Calling Code
    Mobile Prefix [notes 1]
    Size Of Nn (nsn) [notes 2]
    70
    9
    71
    9
    72
    9
    73
    9
  4. Vor einem Tag · 011 - international prefix; dial first when calling abroad from the US or Canada. 45 - Country Code for Denmark. Phone Number - 8 digits. example call from the United States or from Canada to Denmark: 011 45 ???? ????

  5. National conventions for writing telephone numbers vary by country. The International Telecommunication Union (ITU) publishes a recommendation entitled Notation for national and international telephone numbers, e-mail addresses and Web addresses.

  6. 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.