Area Code 1 – São Paulo

Geographic Overview

The +55 1 area code is a geographic National Destination Code (NDC) assigned to the state of São Paulo, Brazil. It covers the capital city of São Paulo and a number of surrounding municipalities within the Greater São Paulo metropolitan region. This is the most populous and economically significant area code in Brazil, hosting the country's primary financial hub (Avenida Paulista), major corporate headquarters, and the São Paulo–Guarulhos International Airport (GRU). The code serves both fixed-line (PSTN) and some VoIP-based local services, with numbers typically 10 digits long when dialed domestically in the format 11 XXXX-XXXX.

Dialing Formats

For callers within Brazil, local calls within the same area code can be made using the 8-digit subscriber number (XXXX-XXXX). However, for calls from other Brazilian states, the full national format is required: 0 + operator code + 11 + XXXX-XXXX. International callers should dial +55 11 XXXX-XXXX, omitting the leading trunk prefix '0' and any operator code. For example, a number in São Paulo might be dialed as +55 11 3456-7890 from abroad.

Overlay and Numbering

Currently, the São Paulo area code does not have an overlay; the 11 code is exclusive to the region. However, due to high demand, the National Telecommunications Agency (ANATEL) has implemented number conservation measures. All numbers in this code are 10 digits (including the area code), and mobile numbers begin with the digit '9' (e.g., 11 9XXXX-XXXX). This is crucial for identifying whether a number is mobile or fixed, as mobile numbers are non-geographic in practice but still carry the geographic NDC.

Caller Instructions

Local callers should always dial the full 10-digit number (including area code) for mobile numbers, even for same-code calls, due to the 9-digit mobile format. For fixed-line calls within the same code, 8-digit dialing is still permitted. International callers must ensure they replace the Brazilian trunk prefix '0' with the international access code of their country, followed by Brazil's country code 55 and the area code 11. For example, from the US, a call to São Paulo would be dialed as 011 55 11 XXXX-XXXX.

Regulatory and Technical Notes

Number portability is available in Brazil, allowing users to retain their numbers when changing operators or moving within the same area code. However, porting does not change the geographic association of the NDC. VoIP services may use this code, but they must comply with ANATEL regulations and provide accurate caller ID. The code is managed by ANATEL and allocated to multiple operators, including legacy incumbent Telefônica Brasil (Vivo) and various competitors.