Area Code 157 – Flen-Malmköping

Overview of Sweden's Area Code 157

Area code 157 is a geographic destination code within the Swedish national numbering plan, administered by the Swedish Post and Telecom Authority (PTS) in accordance with ITU-T E.164 recommendations. It serves the Flen-Malmköping region, located in the southeastern part of Södermanland County. This area encompasses the municipality of Flen and the urban area of Malmköping, along with surrounding rural communities. The code is used for fixed-line (PSTN) and fixed-wireless services, and it is assigned to local exchange areas that form part of the public switched telephone network.

Geographic Coverage and Administration

The 157 numbering area covers a predominantly rural and semi-urban territory, with Flen serving as the central administrative hub. Flen is situated approximately 120 kilometers southwest of Stockholm, while Malmköping lies about 15 kilometers north of Flen. The region is known for its scenic landscapes, small-scale industries, and historical sites. The area code is part of the larger Södermanland numbering region, which is split into several geographic codes, including 0155 (Nyköping), 0156 (Katrineholm), and 0157 (Flen-Malmköping).

Dialing Formats and Procedures

For callers within Sweden, the national trunk prefix 0 must be dialed before the area code when calling from a different numbering area. Thus, a local call from outside the 157 region would be dialed as 0157-XXXXXX. Within the same area code, callers can often use the seven-digit subscriber number directly, but this depends on the specific local exchange and operator practices. For international callers, the country code +46 replaces the leading zero, so the number is formatted as +46 157 XXXXXX. It is important to note that the subscriber number length in Sweden is typically 5 to 7 digits, and the total number of digits after the country code is 9, excluding the trunk prefix.

Numbering and Overlay Considerations

Sweden has implemented a closed numbering plan for geographic numbers, meaning that the area code is an integral part of the national significant number (NSN). There is no overlay code in the 157 area; the code is exclusively used for the Flen-Malmköping region. However, number portability allows subscribers to retain their numbers when switching operators, even if they move within the same geographic area. This can occasionally lead to numbers being assigned to different physical locations, but the geographic association remains for routing purposes.

Caller Instructions

For local callers within Sweden: To call a number in the 157 area from another region, dial 0, then 157, followed by the subscriber number. For example, a call to a subscriber number 123456 would be dialed as 0157-123456. For callers outside Sweden: Dial the international access code (e.g., 00 from most European countries, or + from mobile phones), then 46, then 157, and the subscriber number, omitting the leading zero. For instance, an international caller would dial +46 157 123456. It is advisable to check with your service provider for any specific dialing requirements, especially when calling from VoIP or mobile networks.