Area Code 155 – Nyköping-Oxelösund

Geographic Coverage and Administrative Jurisdiction

The Swedish area code 155 is a geographic destination code assigned to the eastern portion of Södermanland County, primarily serving the municipalities of Nyköping and Oxelösund. Nyköping, the administrative seat of the county, is the largest city in the region, while Oxelösund is a coastal municipality known for its deep-water port and steel industry. The code covers a mix of urban and rural areas, including localities such as Arnö, Bergshammar, and Stigtomta, all within the Nyköping Municipality, as well as the entirety of Oxelösund Municipality.

Dialing Formats and Caller Instructions

Within Sweden, calls to numbers in the 155 area code require the national trunk prefix 0 followed by the area code and the subscriber number. The national format is 0 155 XX XX XX. For international callers, the country code +46 replaces the leading zero, resulting in the format +46 155 XX XX XX. When dialing from a foreign country, you must omit the trunk prefix '0'. For example, a local Nyköping number might be dialed as 0155-123 45 domestically, but internationally as +46 155 123 45.

Local calls within the same area code can often be made using only the seven-digit subscriber number, depending on the operator's dialing plan. However, for clarity and to avoid misdialing, it is recommended to always use the full national format when calling from mobile networks or VoIP services.

Numbering Plan and Overlay Considerations

Sweden's numbering plan follows the ITU-T E.164 standard. The area code 155 is part of the closed numbering plan where the total number length for geographic numbers is typically 8 to 9 digits, including the trunk prefix. As of the latest updates, there is no overlay code for this region; the 155 code exclusively serves Nyköping-Oxelösund. Subscriber numbers within this code range from 5 to 7 digits, and the maximum length for a complete international number is 12 digits (including the +46 country code).

Regulatory and Technical Notes

The Swedish Post and Telecom Authority (PTS) administers numbering resources. Geographic numbers like those under 155 are generally tied to a fixed location, which means that calls are routed based on the physical address of the line. However, with the advent of IP-based services, some subscribers may use their geographic number via VoIP, but the number remains associated with the Nyköping-Oxelösund area for emergency services and caller identification purposes. When calling from abroad, be mindful of time zone differences (Central European Time, UTC+1, with daylight saving time).