Area Code 2139 – Oslo
The phone area code for Oslo is 2139 (international format +472139). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 2139
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Oslo
Overview of Area Code 2139
Area code 2139 is a geographic prefix within the Norwegian national numbering plan, allocated to the capital city of Oslo. As part of the +47 country calling code, this prefix is used for fixed-line telephone services (PSTN) and is administered by the Norwegian Communications Authority (Nkom). The code is specifically assigned to the central districts of Oslo, covering both residential and business subscribers.
Geographic Coverage and Dialing Format
The 2139 prefix is one of several local exchange codes serving the Oslo metropolitan area. It is used for landline numbers, typically associated with the city center and surrounding neighborhoods. When dialing a number with this prefix from within Norway, callers must use the full 8-digit subscriber number, which includes the area code. For example, a local number might be formatted as 21 39 XX XX. From abroad, callers must dial the international access code (e.g., 00 or +), followed by Norway's country code 47, and then the 8-digit number, omitting any trunk prefix. Thus, an international caller would dial +47 21 39 XX XX.
Caller Instructions
For local callers within Oslo, dialing the 8-digit number directly is sufficient. For callers outside Oslo but still within Norway, the same 8-digit number is used, as Norway uses a closed numbering plan with no trunk prefix. For international callers, the format is +47 2139 XXXX. It is important to note that the 2139 prefix is geographic, meaning that calls to these numbers are typically charged at local or national rates depending on the caller's location and service provider.
Overlay and Number Portability
Oslo has implemented overlay codes to address the growing demand for telephone numbers, but 2139 remains a dedicated geographic code. Subscribers may have ported their numbers to other operators, but the prefix retains its geographic significance. When contacting services using 2139, users should be aware that the number is tied to a physical location, which can be relevant for emergency services and location-based services.
Usage and Availability
The 2139 prefix is primarily used by businesses and residents in Oslo. It is not a toll-free or premium-rate number, so standard call charges apply. For businesses, having a geographic number can enhance local presence and trust. As with all Norwegian numbers, the total length of the subscriber number is 8 digits, and the prefix 2139 is part of the national numbering plan.