Area Code 218 – Oslo

Geographic Coverage and Administrative Jurisdiction

The Norwegian national destination code 218 is a geographic area code allocated within the Oslo numbering plan. It serves the central and eastern districts of the capital city, including administrative areas such as Sentrum, Grünerløkka, and parts of the inner eastern boroughs. As a geographic prefix, 218 is tied to the PSTN and VoIP infrastructure of the Oslo metropolitan region, and it is administered by the Norwegian Communications Authority (Nkom) under the national numbering plan.

Dialing Formats and Caller Instructions

When calling a number with the 218 prefix from within Norway, subscribers must dial the eight-digit national significant number, which begins with 218. For example, a local call to a subscriber would be placed as 21 80 00 00 (without any trunk prefix, as Norway uses closed numbering). International callers must dial the full E.164 format: +47 218 00 000 (or +47 21 80 00 00, depending on the exact number grouping). The leading plus sign indicates the international access code, followed by Norway's country code 47 and the national destination code 218.

Overlay and Numbering Considerations

Oslo operates with multiple geographic prefixes (e.g., 21, 22, 23, 24, and 218) that overlay the same geographic area. This means that local calls within Oslo require the full eight-digit number, and there is no local dialing abbreviation. The 218 prefix is used for both fixed-line and VoIP services, and number portability allows subscribers to retain their 218 number when changing operators, although the geographic association remains with Oslo.

Caller Guidance

For callers inside Norway, dial the eight-digit number directly. For callers from abroad, replace the leading zero (if any) with +47. For example, to call a 218 number from the United States, dial 011 47 218 00 000. From the United Kingdom, dial 00 47 218 00 000. Always verify the exact number of digits, as Norwegian numbers are eight digits long.