Area Code 231 – Mealhada
The phone area code for Mealhada is 231 (international format +351231). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 231
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Mealhada
Geographic Overview
The area code 231 is a geographic National Destination Code (NDC) within the Portuguese public switched telephone network (PSTN), allocated to the sub-region of Mealhada and its surrounding municipalities. Administratively, this code serves the central-western part of Portugal, specifically the districts of Aveiro and Coimbra, covering localities such as Mealhada, Luso, Buçaco, and parts of the Bairrada wine region. The code is assigned to fixed-line services, and its geographic scope is defined by the physical location of the subscriber's exchange.
Dialing Formats
When calling a fixed-line number in the Mealhada area from within Portugal, subscribers must dial the trunk prefix 0 followed by the area code and the subscriber number, resulting in the national significant number (NSN) format: 231 XXX XXX. For international callers, the country code for Portugal is +351, and the leading trunk prefix is omitted. Therefore, the international dialing format becomes +351 231 XXX XXX. It is important to note that Portuguese fixed-line numbers do not use a separate trunk prefix for domestic calls; the '0' is part of the national dialing plan.
Local and International Call Instructions
- Local calls (within the 231 area): Dial the 9-digit number directly (e.g., 231 123 456).
- National long-distance calls (from other Portuguese areas): Dial 0 + 231 + subscriber number (e.g., 0 231 123 456).
- International calls to Mealhada: Dial your country's exit code, then 351, then 231, then the subscriber number (e.g., from the US: 011 351 231 123 456).
- Calls from Mealhada to international destinations: Dial 00 (international prefix) followed by the destination country code and number.
Numbering and Overlay Considerations
Portuguese fixed-line numbers are 9 digits long, including the area code. The 231 code is not overlaid with any other NDC; it is a standalone geographic code. However, number portability allows subscribers to retain their 231 numbers even if they move to a different operator or, in some cases, to a different geographic region, although the geographic significance may be lost. This is an important consideration for businesses that rely on local presence.
Regulatory and Technical Notes
The allocation and management of Portuguese numbering resources are overseen by ANACOM (Autoridade Nacional de Comunicações), the national regulatory authority. The 231 code is part of the E.164 international numbering plan, ensuring global interoperability. For VoIP services, the same dialing rules apply, but the physical location of the caller may not correspond to the area code, which can affect emergency services routing. Always verify the correct dialing format with your service provider when using alternative telephony services.