Area Code 31 – Mobile Network
The phone area code for Mobile Network is 31 (international format +4531). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 31
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Overview of Danish Mobile Prefix +45 31
In Denmark, the country calling code +45 is used without a trunk prefix, and mobile numbers are non-geographic. The prefix 31 is allocated to mobile network operators (MNOs) and mobile virtual network operators (MVNOs) for cellular services. Numbers beginning with +45 31 are part of the national numbering plan under the Danish Energy Agency (Energistyrelsen) and are used exclusively for mobile communications, including voice, SMS, and data services.
Number Structure and Dialing Format
Danish mobile numbers consist of eight digits in total, including the prefix. For example, a typical number might be +45 31 23 45 67. When dialing domestically, the number is written as 31 23 45 67, without a leading zero. Internationally, callers must use the country code +45, followed by the eight-digit subscriber number. There is no area code or trunk prefix in Denmark; the entire number is dialed as a single sequence.
Service Characteristics and Portability
The 31 prefix is non-geographic, meaning it is not tied to any specific region of Denmark. Subscribers can retain their numbers when moving within the country. Mobile number portability (MNP) is fully implemented, allowing users to switch between operators while keeping their existing number, including those starting with 31. Consequently, the prefix does not indicate a specific carrier; it may belong to any of the major Danish operators such as TDC Net, Telenor Denmark, Telia Denmark, or 3 Denmark, as well as various MVNOs.
Calling and Usage Considerations
For international callers, dialing a Danish mobile number requires the international access code (e.g., 00 from most European countries, or 011 from North America), followed by +45 and the eight-digit number. For example, a caller from the United States would dial 011 45 31 23 45 67. Within Denmark, callers simply dial the eight-digit number directly, whether calling from a fixed line or another mobile. SMS and MMS messages are sent to the same number format.
Charges for calling Danish mobile numbers vary depending on the caller's operator and plan. For callers within Denmark, calls to mobile numbers are typically billed at higher rates than fixed-line calls, unless included in a bundle. For international callers, rates are determined by their home operator's international tariff. It is advisable to check with your service provider for specific costs.
As with all mobile numbers, the 31 prefix is suitable for receiving calls and messages while roaming, subject to the subscriber's roaming agreements. Businesses often use these numbers for customer contact, and they are widely used for personal mobile services across Denmark.