Area Code 31 – Häme
The phone area code for Häme is 31 (international format +35831). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 31
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Häme
Geographic Overview
The Finnish area code 31 is a geographic National Destination Code (NDC) assigned to the Häme region in southern Finland. This area encompasses the historic province of Tavastia (Häme in Finnish) and includes key cities such as Hämeenlinna, the regional capital, along with Riihimäki, Lahti, and Forssa. The code serves both urban centers and surrounding rural municipalities, providing PSTN (fixed-line) services to residential and business subscribers.
Dialing Formats
When calling a Häme number from within Finland, subscribers must use the trunk prefix 0 followed by the area code and the local subscriber number. For example, a local number in Hämeenlinna might be dialed as 03 1234567 from elsewhere in Finland. Internationally, callers should dial the Finnish country code +358, omit the leading trunk zero, and then the area code and subscriber number: +358 3 1234567.
Within the Häme region, local calls may be dialed using only the subscriber number (7–8 digits) if the call remains within the same local exchange area, but this practice is becoming less common as number portability and VoIP services expand. For callers outside Finland, the international format is always required.
Regulatory and Technical Notes
The 31 area code is part of the Finnish numbering plan administered by the Finnish Transport and Communications Agency (Traficom). It is classified as a geographic code, meaning that the tariff and routing are based on the physical location of the line. However, with the advent of number portability, a subscriber may retain a 31 number even if they move outside the region, but this does not change the geographic nature of the code.
Overlay codes have not been introduced for this area; the 31 code remains the sole geographic code for the region. Subscribers in Häme can also be reached via VoIP services that use geographic numbers, but the routing may differ depending on the service provider.
Practical Guidance for Callers
- Local callers: Dial the subscriber number directly if within the same local area; otherwise, use 03 + subscriber number.
- National callers (outside Häme): Dial 0 3 + subscriber number.
- International callers: Dial your country's exit code, then 358 3 + subscriber number (omit the leading zero).
For example, to call a business in Riihimäki from abroad, you would dial +358 3 1234567. Always verify the subscriber number length, as it can vary between 5 and 8 digits depending on the local exchange and historical allocations.