Area Code 255 – Penafiel
The phone area code for Penafiel is 255 (international format +351255). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 255
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Penafiel
Geographic Overview
The +351 255 area code is a geographic National Destination Code (NDC) assigned to the northern region of Portugal, specifically the municipality of Penafiel and its surrounding areas. Penafiel is part of the Porto metropolitan area, located in the Tâmega Subregion. The code covers the city center and several civil parishes, including Marecos, Guilhufe, and Urrô. Administratively, it falls under the district of Porto, and the region is served by both fixed-line and integrated services.
Dialing Formats
When calling a fixed-line number in Penafiel from within Portugal, subscribers must dial the national trunk prefix 0, followed by the area code 255 and the subscriber's 7-digit number. The complete national format is 0 255 XXX XXXX. For example, a local call to a business would be dialed as 0 255 123 4567.
For international callers, the format is +351 255 XXX XXXX (or +351255XXXXXXX when dialing from a mobile phone). The leading 0 is omitted, and the country code +351 is used. For instance, a caller from the UK would dial 00 351 255 123 4567.
Local vs. International Calls
Within Penafiel, local calls are typically charged at a reduced rate, but with the widespread adoption of flat-rate plans, the distinction has blurred. For callers outside Portugal, it is essential to use the international prefix of their country (e.g., 00 in most of Europe, 011 in North America) before the country code and area code. No additional trunk prefix is required.
Overlay and Numbering Plan Considerations
As of the latest ITU-T E.164 guidelines, the 255 area code does not have an overlay code. The Portuguese regulator, ANACOM, has not introduced an overlay for this region, so the 9-digit national significant number (NSN) format remains consistent. However, users should be aware that number portability allows subscribers to retain their 255 numbers even if they move to a different operator, but the geographic significance remains tied to the original location.
Caller Instructions
- Local callers (within Penafiel): Dial the 9-digit number starting with 0, e.g., 0 255 123 4567.
- National callers (outside Penafiel): Dial 0 255 followed by the subscriber number.
- International callers: Dial your country's exit code, then 351, then 255, then the 7-digit subscriber number (omit the initial 0).
For any assistance, contact your service provider for specific tariff information.