Area Code 2145 – Oslo
The phone area code for Oslo is 2145 (international format +472145). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 2145
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Oslo
Overview of Area Code +47 2145
The Norwegian telephone numbering plan, administered by the Norwegian Communications Authority (Nkom), follows the international standard ITU-T E.164. Norway's country calling code is +47, and unlike many countries, it uses a closed numbering plan with no trunk prefix. This means that the same number format is used for both domestic and international calls, with the leading '+' and country code only required for calls from abroad.
Area code 2145 is a geographic prefix assigned to the capital region of Oslo. It is part of a range of numbers allocated to fixed-line services within the greater Oslo area, which includes the central business district and surrounding residential neighborhoods. As a geographic number, it is tied to a physical location, and the tariff for calling it is typically based on the caller's own fixed or mobile plan, with no additional long-distance charges when dialed from anywhere within Norway.
Dialing Formats and Usage
For callers within Norway, the full national number is dialed as 21 45 XX XX (8 digits after the leading 0, which is not used in Norway). For international callers, the number is dialed as +47 21 45 XX XX. The prefix 2145 is an 8-digit subscriber number, and the total length of a Norwegian phone number is always 8 digits, regardless of the prefix.
Numbers with the 2145 prefix are predominantly used by businesses and organizations that require a local presence in Oslo. They are not associated with any specific mobile network operator and are generally not portable to mobile networks, as geographic numbers are typically tied to fixed-line services. However, some VoIP providers may offer numbers with this prefix, allowing businesses to maintain a virtual presence in Oslo while routing calls over the internet.
Regulatory and Operational Considerations
Norway has implemented number portability, which means that a subscriber can retain their 2145 number when switching between fixed-line operators. However, the geographic nature of the prefix remains unchanged, and the number continues to be associated with the Oslo area. There are no overlay codes in Norway; instead, new geographic numbers are assigned from existing prefixes or new prefixes are introduced within the same numbering area.
For businesses, having a 2145 number can enhance local credibility and customer trust. It is also a requirement for certain services, such as receiving calls from the Norwegian emergency services, which rely on location information. When calling from abroad, it is important to use the full international format, omitting any leading zeros that might be used in other countries' dialing plans.
In summary, the +47 2145 prefix is a geographic identifier for Oslo, providing a reliable and recognizable means of communication for both local and international callers.