Area Code 40 – Mobile Network
The phone area code for Mobile Network is 40 (international format +4540). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 40
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Overview of Danish Mobile Prefix +45 40
The +45 40 prefix is a non-geographic mobile numbering range allocated within Denmark's national numbering plan, as overseen by the Danish Energy Agency (Energistyrelsen). Unlike geographic area codes, which correspond to specific towns or regions, the 40 prefix is assigned to mobile network operators (MNOs) and mobile virtual network operators (MVNOs) operating across the entire country. This means that a number beginning with +45 40 is not tied to any physical location; it is used exclusively for mobile services, including voice, SMS, and data.
Danish mobile numbers, including those starting with 40, consist of eight digits in total after the country code. For example, a full international format would be +45 40XX XXXX, while nationally it is written as 40XX XXXX. When dialing from abroad, you must include the +45 country code and drop any leading trunk prefix (Denmark uses '00' for international calls, but no trunk prefix for domestic calls).
Technical and Regulatory Aspects
The 40 prefix is part of the closed numbering plan of Denmark, meaning that all national numbers, including mobile, are dialed with the same length (8 digits) without any area code. Mobile numbers are portable, so a subscriber may retain their 40 number when switching operators. This portability is managed by the central reference database, ensuring that calls are routed correctly regardless of the current network.
From a routing perspective, calls to +45 40 numbers are treated as mobile calls, and termination charges may apply depending on the caller's network and the subscriber's plan. For international callers, it is essential to use the full international format: +45 40XX XXXX. For example, a typical number might be +45 40 123 456 (though actual numbers are 8 digits, so the example should be +45 40 12 34 56).
Usage and Consumer Guidance
Because the 40 prefix is non-geographic, it is commonly used for personal mobile subscriptions, business mobile lines, and IoT (Internet of Things) devices that require cellular connectivity. When receiving calls from a +45 40 number, you can expect it to be from a mobile device, not a fixed line. For businesses, using a 40 number can provide a nationwide presence without regional constraints.
If you are dialing from within Denmark, simply dial the 8-digit number (e.g., 40 12 34 56). From outside Denmark, dial your country's international access code (typically 00 or +), followed by 45 and the 8-digit number. Always verify the number length and include the correct country code to avoid misdialing.