Area Code 2380 – Oslo
The phone area code for Oslo is 2380 (international format +472380). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 2380
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Oslo
Overview of Area Code 2380
Area code 2380 is a geographic prefix within the Norwegian national numbering plan, assigned to the capital region of Oslo. It forms part of the larger Oslo numbering area, which historically used two-digit area codes (02 for Oslo) before the migration to eight-digit subscriber numbers and the current open dialing plan. Today, the prefix 2380 is used for fixed-line telephone services within specific districts of Oslo, typically serving businesses and residential customers connected to the public switched telephone network (PSTN) or VoIP-based fixed services.
Geographic Coverage and Administrative Jurisdiction
The 2380 prefix covers central and surrounding neighborhoods of Oslo, the administrative capital of Norway. Oslo is the economic and governmental hub of the country, hosting the Storting (parliament), the Royal Palace, and numerous corporate headquarters. The prefix is allocated to local exchange areas that may include districts such as Sentrum, Frogner, Majorstuen, and Grünerløkka, though exact boundaries are managed by the Norwegian Communications Authority (Nkom). As with all geographic numbers in Norway, the prefix does not necessarily correspond to a precise street address but indicates the general billing and routing location.
Dialing Formats and Instructions
For callers within Norway, the number must be dialed in its full national format: 23 80 XX XX (eight digits after the leading trunk prefix). The national trunk prefix is 0, but in Norway, the trunk prefix is not used for geographic numbers; instead, callers simply dial the eight-digit subscriber number directly. For example, to call a number in Oslo with the prefix 2380, a local caller would dial 2380XXXX (where XXXX is the subscriber's four-digit line number).
For international callers, the number must be dialed with the country calling code +47, followed by the eight-digit national number. Thus, a caller from abroad would dial +47 2380 XXXX. It is important to note that the leading '0' is not used when dialing from outside Norway. For instance, if the local number is 23 80 12 34, the international format is +47 23 80 12 34.
Overlay and Numbering Plan Considerations
Oslo does not have an overlay area code; instead, the entire city uses a single area code concept with multiple prefixes (e.g., 21, 22, 23, 24) under the +47 country code. This means that local calls within Oslo are dialed using only the eight-digit number, without any area code differentiation. The numbering plan is closed, and all subscriber numbers are eight digits long. The prefix 2380 is part of the 23xx range, which is primarily used for fixed-line services, but some numbers may be used for VoIP services that are geographically tied to Oslo.
Practical Guidance for Callers
When calling a 2380 number from a mobile phone in Norway, the same eight-digit dialing applies. If you are calling from a foreign country, always replace the local trunk prefix with the international access code (00 or +) followed by 47. For example, a caller in the United Kingdom would dial 00 47 23 80 XXXX. It is also advisable to confirm the correct number of digits, as some older numbers may have been migrated to different prefixes due to number portability. However, geographic numbers are generally not portable outside their designated area, so a 2380 number will always be associated with Oslo.