Area Code 3139 – Minas Gerais

Overview of Area Code 3139

Area code 3139 is a geographic National Destination Code (NDC) within the Brazilian telephony numbering plan, assigned to the state of Minas Gerais. It is part of the larger 31 area code region, which covers the central-eastern portion of the state, including the capital, Belo Horizonte, and its metropolitan area. The prefix 3139 is used for landline (PSTN) numbers, typically associated with specific municipalities or neighborhoods within this region. It is important to note that 3139 is not a mobile prefix; mobile numbers in Brazil begin with 9 after the area code (e.g., 31 9XXXX-XXXX).

Geographic Coverage and Administration

The 31 area code region is administered by the National Telecommunications Agency (ANATEL) and serves a densely populated area with significant economic activity. The 3139 prefix is allocated to fixed-line services, often provided by incumbent operators such as Oi (now part of Vivo) or alternative carriers. The specific cities or districts covered by 3139 may vary, but they are all within the Belo Horizonte metropolitan area or nearby municipalities. For precise local coverage, consult your service provider or ANATEL's numbering database.

Dialing Formats and Instructions

To call a number with area code 3139 from within Brazil, you must dial the area code followed by the 8-digit subscriber number. For example, if the local number is 1234-5678, you would dial 31 1234-5678. From abroad, you need to include the Brazilian country code (+55) and drop the leading zero of the area code. Thus, the international format becomes +55 31 1234-5678.

For local callers within the same area code region, it is often possible to dial only the 8-digit number without the area code, depending on the operator's local dialing rules. However, for clarity and to avoid misdials, it is recommended to always include the area code when dialing from a mobile phone or from a different region.

Overlay and Numbering Considerations

Currently, there is no overlay area code for the 31 region; the 31 code is used exclusively for the entire metropolitan area. However, due to increasing demand, ANATEL has implemented number conservation measures, and new landline numbers may be assigned with different prefixes within the 31 code. The 3139 prefix is just one of many available in this region. When dialing from abroad, always use the full international format to ensure proper routing.

Caller Instructions

For local callers: If you are dialing from a landline within the 31 area code, you can often dial just the 8-digit number. For mobile callers, always include the area code (31). For long-distance calls within Brazil, dial 0 + operator code + 31 + the 8-digit number (e.g., 0 15 31 1234-5678). For international callers, dial your country's exit code, then 55, then 31, and the 8-digit number. Always verify the number length and format with your service provider if you encounter issues.