Area Code 216 – Oslo

Geographic Coverage and Administrative Jurisdiction

The +47 216 numbering range is a geographic allocation assigned to the Oslo metropolitan area, the capital and most populous city of Norway. As a National Destination Code (NDC) within the Norwegian numbering plan, 216 serves as a Central Office Code for fixed-line PSTN and VoIP services registered to addresses within Oslo's administrative boundaries. This includes the city center (Sentrum), boroughs such as Frogner, St. Hanshaugen, Grünerløkka, and Gamle Oslo, as well as surrounding suburban districts that form part of the greater Oslo region. The code is managed by the Norwegian Communications Authority (Nkom), which oversees the national E.164 numbering resources.

Dialing Formats and Caller Instructions

For domestic callers within Norway, the number is dialed in its full national format: 21 60 00 00 (or the specific subscriber number following the 216 prefix). The leading '0' trunk prefix is not used for Norwegian numbers; instead, the country's international prefix '+47' is also the national significant number prefix. Therefore, local callers simply dial the eight-digit subscriber number, which includes the 216 area code.

For international callers, the correct format is +47 21 60 00 00. This follows the ITU-T E.164 standard: the '+' sign, the country code 47, and the national significant number (NDC 216 plus the five-digit subscriber line). When calling from a mobile phone, the '+' key is typically available by pressing and holding '0'.

Overlay and Numbering Considerations

Oslo does not have an overlay area code; the entire city uses the 2-digit NDC '2' followed by a 6-digit subscriber number, with the first digit of the subscriber number (in this case '1' from 216) further segmenting the numbering pool. This structure allows for a theoretical capacity of up to 10 million numbers under the '2' range, ensuring sufficient numbering resources for the capital's dense telecommunications market. No additional area code changes are anticipated in the near term.

Service Characteristics and Usage

Numbers under the 216 prefix are primarily used for fixed-line voice services, including traditional PSTN and modern VoIP subscriptions. Many businesses in Oslo utilize these numbers for their main office lines, customer service centers, and administrative departments. Since the code is geographic, tariffs are typically based on the caller's location and subscription plan, with calls from other Norwegian fixed networks often charged at local or national rates. For callers abroad, international rates apply as determined by their home operator.

When dialing a 216 number from a foreign country, it is essential to replace the international access code (00 or 011) with '+', ensuring proper routing through the global telephone network. Always verify the complete number, as the 216 prefix is part of an eight-digit sequence; omitting any digit will result in a failed call.