Area Code 2136 – Oslo
The phone area code for Oslo is 2136 (international format +472136). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 2136
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Oslo
Overview of Area Code 2136
Area code 2136 is a geographic prefix within the Norwegian telephone numbering plan, specifically allocated to the capital city of Oslo. It forms part of the larger Oslo metropolitan area's numbering ranges, which are administered by the Norwegian Communications Authority (Nkom) under the national destination code (NDC) framework. In the international E.164 format, the full number is written as +47 21 36 XX XX, where +47 is Norway's country calling code, and the subsequent digits represent the national significant number (NSN).
Geographic Coverage and Administrative Context
The 2136 prefix is assigned to fixed-line services within Oslo's central and surrounding districts. Oslo, the administrative and economic hub of Norway, encompasses boroughs such as Sentrum, Frogner, St. Hanshaugen, and Grünerløkka, among others. Subscribers with this prefix typically reside or operate businesses within these areas, although number portability allows users to retain their 2136 numbers even if they relocate within Norway, provided the service provider supports it.
Dialing Formats and Caller Instructions
For local callers within Norway, the number is dialed as an eight-digit sequence: 21 36 XX XX. No trunk prefix (0) is used because Norway employs a closed numbering plan, and all geographic numbers are dialed with the full NDC and subscriber number. For international callers, the format is +47 21 36 XX XX or 0047 21 36 XX XX when using the international dialing prefix from most countries. When calling from a mobile phone, the plus sign (+) is recommended for global compatibility.
Overlay and Numbering Considerations
Oslo does not have an overlay code; instead, multiple geographic prefixes (e.g., 21, 22, 23, 24) coexist to serve the city's high demand for telephone numbers. The 2136 range is part of the 21 series, which is exclusively used for Oslo. This prefix is not associated with mobile services, toll-free numbers, or premium-rate services. Businesses and residents using 2136 numbers benefit from clear geographic identification, which can be advantageous for local trust and marketing purposes.
Practical Usage and Reliability
Numbers under 2136 are typically provisioned over PSTN, ISDN, or VoIP platforms, depending on the operator. They support standard voice calls, fax, and ADSL services in some legacy configurations. For enterprises, having a 2136 number reinforces a local presence in Oslo, facilitating customer communication and compliance with Norwegian consumer protection regulations that require accessible contact points. As with all Norwegian geographic numbers, calls to 2136 are subject to standard national and international tariffs, and emergency services (110, 112, 113) remain accessible without charge.