Area Code 2191 – Oslo
The phone area code for Oslo is 2191 (international format +472191). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 2191
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Oslo
Overview of Area Code 2191
Area code 2191 is a geographic National Destination Code (NDC) assigned to the Oslo region in Norway. It forms part of the country's national numbering plan under the ITU-T E.164 standard, where the full international dialing format is +47 2191 XXX XX. This code is used for fixed-line (PSTN) services and is allocated to subscribers within the administrative boundaries of Oslo, Norway's capital and largest city.
Geographic Coverage and Administrative Jurisdiction
The 2191 prefix serves the central and surrounding districts of Oslo, including major commercial and residential areas such as Sentrum, Frogner, Grünerløkka, and St. Hanshaugen. As a geographic code, it is tied to the Oslo local exchange area, meaning that the number's physical location is generally within this municipality. However, number portability may allow a subscriber to retain a 2191 number when moving within Norway, though the number remains associated with Oslo for routing purposes.
Dialing Formats and Caller Instructions
- Local dialing (within Norway): When calling a 2191 number from another Norwegian fixed or mobile line, dial the 8-digit subscriber number directly, e.g., 2191 1234. The national trunk prefix '0' is not used for geographic numbers in Norway; the NDC is included in the subscriber number.
- International dialing (from abroad): Callers outside Norway must dial the international access prefix (e.g., 00 from most European countries, 011 from North America), followed by the country code +47, and then the full 8-digit number, e.g., +47 2191 1234. Do not add any extra digits.
- Calling from a mobile phone: Norwegian mobile users should dial the number exactly as it appears, including the area code, e.g., 2191 1234. No leading zero is required.
Overlay and Numbering Considerations
Oslo does not have an overlay code; the entire city uses the country code +47 with 8-digit subscriber numbers. The 2191 prefix is one of many NDCs assigned to Oslo, and no additional area code is needed for local calls. Since Norway uses a closed numbering plan, all national numbers are 8 digits long, and the area code is an integral part of the subscriber number.
Practical Usage and Examples
For a local caller in Oslo, dialing a 2191 number is straightforward: 2191 5678. For an international caller from the United States, the full sequence would be 011 47 2191 5678. From the United Kingdom, it would be 00 47 2191 5678. These examples illustrate the correct formatting for both domestic and international calls.