Area Code 2193 – Oslo
The phone area code for Oslo is 2193 (international format +472193). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 2193
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Oslo
Geographic Overview
The +47 2193 prefix is a geographic number range allocated within the Oslo numbering area of Norway. As part of the national destination code (NDC) 21, this prefix serves the capital region, including central Oslo and its surrounding administrative districts. The Norwegian Communications Authority (Nkom) manages these allocations under the ITU-T E.164 international numbering plan.
Dialing Formats
When calling a number with the 2193 prefix from within Norway, subscribers must dial the eight-digit national significant number (NSN) in the format 21 93 XX XX. No trunk prefix (such as '0') is used in Norway; the national number is dialed directly. For international callers, the full E.164 format is required: +47 21 93 XX XX. This replaces the leading '47' with the international access code of the originating country (e.g., '00' from most European countries, '011' from North America).
Geographic Allocation and Numbering
The 21 NDC is designated for geographic use in Oslo, and the 2193 prefix specifically covers a portion of this area. While the prefix is tied to a fixed-line exchange, number portability allows subscribers to retain their number when switching providers, even if they relocate outside the traditional exchange area. However, the tariff structure remains based on the original geographic allocation.
Caller Instructions
- Local callers in Oslo: Dial the eight-digit number directly (e.g., 21 93 XX XX).
- Callers from other Norwegian regions: Dial the same eight-digit number; no area code is added because Norway uses a closed numbering plan.
- International callers: Dial the international access code, then 47, then the eight-digit number (e.g., +47 21 93 XX XX).
Regulatory and Technical Notes
All Norwegian geographic numbers are subject to strict number portability regulations. The 2193 prefix is not associated with any mobile or VoIP service; it is exclusively a fixed-line range. Calls to these numbers are typically charged at standard national rates, which may vary depending on the caller's operator and subscription plan. For businesses, having a geographic Oslo number can enhance local presence and customer trust.