Area Code 173 – Öregrund-Östhammar
The phone area code for Öregrund-Östhammar is 173 (international format +46173). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 173
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Öregrund-Östhammar
Geographic Coverage and Administrative Jurisdiction
The Swedish area code 173 is a geographic destination code assigned to the Öregrund–Östhammar region, located in Uppsala County on the east coast of Sweden. This numbering area encompasses the coastal towns of Öregrund and Östhammar, along with their surrounding rural localities and archipelago communities. Administratively, the code falls under the jurisdiction of the Swedish Post and Telecom Authority (PTS), which oversees the national numbering plan in accordance with ITU-T E.164 recommendations. The region is part of the historic Roslagen area, known for its maritime heritage and summer tourism.
Dialing Formats and Caller Instructions
When calling a landline within the 173 area code, the national subscriber number consists of the area code (without the leading trunk prefix '0') followed by a local number of 5 to 7 digits, resulting in a total national significant number (NSN) of 8 to 9 digits. For domestic calls placed from other parts of Sweden, the full national format is 0173-XXXXX (including the trunk prefix '0'). For international callers, the country code for Sweden is +46, so the international dialing format becomes +46 173 XXXXX, omitting the leading '0'. Local calls within the same area code can be made using only the local subscriber number, without the area code, depending on the operator's dialing plan.
Overlay and Numbering Considerations
As of the current numbering plan, there is no overlay code for the 173 area; the region retains its exclusive geographic code. However, number portability allows subscribers to retain their 173 numbers when switching to a different operator, including VoIP providers, which may result in the number being served from a non-geographic location. This does not affect the dialing format, but callers should be aware that the geographic association is not absolute.
Practical Examples
- Local call within Öregrund: dial XXXXX (local number only).
- Domestic call from Stockholm: dial 0173-XXXXX.
- International call from abroad: dial +46 173 XXXXX.
For businesses and residents in the area, the 173 code is an integral part of their identity, often used in marketing and customer contact. Visitors and new residents should ensure they use the correct format to avoid misdialing. The code is also used for fax and fixed-line data services, though its primary use remains voice telephony.