Area Code 2142 – Oslo
The phone area code for Oslo is 2142 (international format +472142). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 2142
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Oslo
Geographic Coverage and Administrative Jurisdiction
The Norwegian country code +47 is paired with the geographic area code 2142 to reach subscribers within the capital region of Oslo. Administratively, this code falls under the jurisdiction of the Norwegian Communications Authority (Nasjonal kommunikasjonsmyndighet, Nkom), which allocates numbering resources according to the national numbering plan based on ITU-T E.164 recommendations. The 2142 prefix is part of the 21xx range, which is specifically assigned to the Oslo metropolitan area, encompassing the city center and surrounding districts. This range is distinct from other Norwegian geographic codes such as 22 (also Oslo), 23 (Oslo), and 24 (Romerike), but 2142 is a dedicated central office code within the Oslo exchange hierarchy.
Dialing Formats and Caller Instructions
For local callers within Norway, the national significant number (NSN) for a subscriber with the 2142 prefix is eight digits long, formatted as 21 42 XX XX. When dialing from a fixed or mobile line inside Norway, you must include the trunk prefix '0' before the area code, resulting in the complete national format: 0 21 42 XX XX. However, international callers must omit the leading '0' and dial the full international format: +47 21 42 XX XX. For example, a typical Oslo number would be dialed as +47 21 42 12 34 from abroad, while within Norway you would dial 021 42 12 34. It is important to note that Norway does not use a separate trunk code for international calls; the '+' sign replaces the international access code (00) when dialing from most mobile phones.
Overlay Considerations and Number Portability
Oslo has implemented several overlay codes to address the growing demand for telephony services, but the 2142 prefix remains a distinct geographic code without overlay complexities. Subscribers in this area may have migrated from older analog exchanges to digital PSTN or VoIP services, but the geographic significance of the code persists. Number portability allows users to retain their 2142 numbers when switching between operators, even if they move outside the Oslo region, which can occasionally lead to a number being associated with a different physical location. However, for the majority of calls, the 2142 prefix reliably indicates a subscriber originally located in the Oslo area.
Practical Usage and Cost Considerations
When calling a 2142 number, standard national or international tariffs apply depending on the caller's location. For businesses, having a geographic Oslo number can enhance local presence and trust. For callers, it is essential to verify the correct number length and formatting to avoid misdialing. As with all Norwegian geographic numbers, calls from mobile phones to 2142 numbers are typically included in standard call packages, but international roaming charges may apply if you are outside Norway. Always check with your service provider for specific rates.