Area Code 670 – Strömsund

Overview of Area Code 670 (Strömsund, Sweden)

Area code 670 is a geographic National Destination Code (NDC) assigned to the Strömsund region in Jämtland County, Sweden. It covers the municipality of Strömsund and its surrounding localities, including Strömsund town, Hammerdal, and other smaller communities. The code is part of the Swedish national numbering plan, which follows ITU-T E.164 recommendations. When dialing a subscriber within this area, the national significant number consists of the area code followed by a five- to seven-digit local number, depending on the specific exchange. The full national number typically has a total length of 8 to 9 digits, excluding the leading trunk prefix '0'. For international callers, the number is formatted as +46 670 XXX XXX, where '+46' is the country calling code for Sweden, and the leading '0' of the area code is omitted.

Geographic Coverage and Administrative Jurisdiction

The 670 area code serves the Strömsund Municipality, which is situated in the northern part of Jämtland County, near the Norwegian border. This is a sparsely populated region known for its vast forests and lakes. The main administrative center is Strömsund, located approximately 100 kilometers northwest of Östersund, the county seat. Other notable localities within the code include Hammerdal, Backe, and Gäddede. The area code is administered by the Swedish Post and Telecom Authority (PTS), which oversees the national numbering plan.

Dialing Procedures

• Local calls (within Sweden): To call a number in Strömsund from another part of Sweden, dial the trunk prefix '0' followed by the area code '670' and the subscriber number. For example, to call a number in Strömsund, you would dial 0-670-XXXXX.
• International calls (from abroad): When calling from outside Sweden, dial the international access prefix (e.g., '00' in most countries) followed by Sweden's country code '46', then the area code without the leading '0', and the subscriber number. For instance, a call from the United States would be 011-46-670-XXXXX.
• Within the same area code: For calls within the 670 area, it may be possible to dial only the local subscriber number without the area code, depending on the operator's dialing plan. However, for clarity and consistency, it is recommended to always include the area code.

Numbering and Overlay Considerations

Sweden has not implemented overlay codes for geographic areas; instead, each geographic region has a unique area code. The 670 code is not overlaid, and no changes are currently planned. Subscriber numbers within this code are allocated to fixed-line services, including PSTN and VoIP, and are primarily used by residential and business customers. The code is not portable to mobile networks, as mobile numbers in Sweden have their own distinct prefixes (e.g., 70, 72, 73). However, number portability within the fixed network is allowed, meaning a subscriber may retain their 670 number if they switch to a different fixed-line operator.

Practical Guidance for Callers

For local callers within Sweden, always remember to include the trunk prefix '0' when dialing from a different area. For international callers, ensure you drop the leading '0' and use the +46 country code. When saving contacts, it is advisable to store numbers in international format (+46 670 XXX XXX) to avoid confusion when traveling or using VoIP services. This area code is not associated with any premium-rate or special services, so standard call charges apply based on your operator's tariff.