Area Code 277 – Idanha-a-Nova

Geographic Coverage and Administrative Context

The +351 277 country and area code combination corresponds to a geographic numbering zone within the Portuguese public switched telephone network (PSTN), specifically allocated to the municipality of Idanha-a-Nova, located in the Castelo Branco District of the Centro region. This area code serves the town of Idanha-a-Nova and its surrounding civil parishes, including Zebreira, Segura, and Monsanto, as well as other localities within the municipality's boundaries. The code is assigned by ANACOM, Portugal's national regulatory authority for communications, following the national numbering plan that adheres to ITU-T E.164 recommendations.

Dialing Formats and Caller Instructions

For callers within Portugal, the national significant number (NSN) for a fixed-line subscriber in this region consists of the area code (277) followed by a seven-digit subscriber number. The complete national format is 277 XXX XXX, and callers must dial all ten digits, including the leading '0' of the area code, even for local calls. For example, to reach a local business, one would dial 277 123 456.

International callers should dial the Portuguese country code (+351) followed by the area code without the leading '0' and the subscriber number. Thus, the international format becomes +351 277 XXX XXX. For instance, a caller from abroad would dial +351 277 123 456.

Numbering Plan and Overlay Considerations

As of the current numbering plan, there is no overlay code for the 277 area; the geographic numbering zones in Portugal are generally not overlaid, and each municipality retains a distinct area code. The subscriber number length within this code is seven digits, which is standard for Portuguese fixed-line services. The code is exclusively for fixed-line services, and it is not used for mobile or non-geographic services.

Practical Information for Callers

• Local calls: Within the same area code, dial the full 10-digit number (e.g., 277 123 456).
• National long-distance calls: From other Portuguese regions, dial the same 10-digit number (e.g., 277 123 456). No trunk prefix is required.
• International calls to Idanha-a-Nova: Dial the international access code (00 from most countries, or '+') followed by 351 and then 277 XXX XXX.
• Caller ID: When receiving calls, the caller ID may display the number in international format (+351 277 XXX XXX) or national format depending on the originating network.

Understanding these dialing protocols ensures seamless connectivity with fixed-line subscribers in Idanha-a-Nova, whether you are placing a local call or contacting the region from abroad.