Area Code 215 – Oslo
The phone area code for Oslo is 215 (international format +47215). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 215
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Oslo
Geographic Coverage and Administrative Jurisdiction
The +47 215 prefix is a geographic number range assigned to the Oslo metropolitan area, the capital and most populous city of Norway. As part of the Norwegian numbering plan administered by the Norwegian Communications Authority (Nkom), this prefix falls under the National Destination Code (NDC) 21, which serves the greater Oslo region. The specific 215 range is allocated to fixed-line services, typically used by businesses and residential subscribers within the city's central districts and surrounding urban zones. While the prefix is geographically tied to Oslo, modern number portability may mean that a number with this prefix could be routed to a different physical location, but the caller should still expect a local Oslo presence.
Dialing Formats and Caller Instructions
For domestic callers within Norway, the number is dialed as an eight-digit subscriber number, with the prefix included: 215XXXXX. No trunk prefix '0' is used in Norway, as the country uses a closed numbering plan. For international callers, the full E.164 format must be used: +47 215XXXXX (or 0047 215XXXXX from countries using the international prefix 00). When dialing from a mobile phone, the plus sign (+) is typically used to denote the international access code. Local callers should note that while the prefix is geographic, calls to 215 numbers are treated as local calls within Norway, and tariffs depend on the caller's operator and subscription plan.
Overlays and Numbering Considerations
Norway does not use area code overlays in the traditional sense; instead, the country adopted a closed numbering plan in 1992, eliminating the need for trunk prefixes. The 21 NDC covers the entire Oslo region, and the 215 prefix is one of several sub-ranges within it. Because of number portability, a 215 number may be served by any operator, and the original geographic assignment does not restrict routing. This means that businesses can retain their 215 numbers even if they move their operations outside Oslo, provided they maintain a service address in Norway.
Usage and Practical Examples
The 215 prefix is commonly used by companies seeking a local Oslo presence, including corporate offices, government agencies, and service providers. For example, a business in downtown Oslo might list its customer service line as +47 215 00 123. When calling from abroad, a user would dial +47 215 00 123. From a Norwegian mobile, they would simply dial 215 00 123. It is important to note that the number of digits after the prefix is fixed: the total subscriber number (including the prefix) is always eight digits, so the remaining digits after 215 must be five digits.