Area Code 3131 – Minas Gerais
The phone area code for Minas Gerais is 3131 (international format +553131). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 3131
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Minas Gerais
Overview of Area Code 3131
Area code 3131 is a geographic National Destination Code (NDC) within the Brazilian national numbering plan, assigned to the state of Minas Gerais. Specifically, it serves the metropolitan region of Belo Horizonte, the state capital, and its surrounding municipalities. This code is part of the larger 31 area code cluster, which covers central and eastern Minas Gerais, but 3131 is dedicated to the capital's urban core and immediate suburbs.
Geographic Coverage and Administrative Jurisdiction
The 3131 prefix is allocated to landline (PSTN) and fixed-wireless services within the Belo Horizonte metropolitan area. Municipalities included under this code include Belo Horizonte, Contagem, Betim, Nova Lima, and Sabará, among others. The region is the administrative and economic heart of Minas Gerais, hosting major government institutions, corporate headquarters, and industrial hubs.
Dialing Formats and Caller Instructions
For local callers within the 3131 area, the standard local dialing format is the eight-digit subscriber number (e.g., 3131-XXXX). When calling from outside the area code but still within Brazil, you must dial the trunk prefix 0, followed by the carrier selection code (usually 15 for Embratel, 21 for Claro, etc.), then the area code and the subscriber number: 0 + carrier code + 31 + 3131-XXXX. For international callers, the format is +55 31 3131-XXXX (the leading 0 is omitted).
Overlay and Numbering Considerations
Belo Horizonte has implemented an overlay plan, meaning that multiple area codes (31, 3131, and others) may serve the same geographic region. This allows for additional numbering capacity without changing existing numbers. As a result, callers must always dial the full area code (including the NDC) even for local calls, as per the Brazilian ten-digit dialing rule for fixed lines. This is crucial for call routing and to avoid misdialing.
Practical Examples
- Local call (within 3131): Dial 3131-XXXX.
- National call (from São Paulo, 11): Dial 0 + 15 + 31 + 3131-XXXX.
- International call (from the USA): Dial 011 55 31 3131-XXXX.
Understanding these formats ensures proper connectivity for both residential and business users. For businesses, having a 3131 number establishes a local presence in Belo Horizonte, which can enhance customer trust and accessibility.