The National Telecommunications Agency (Anatel) is the Brazilian Government agency in charge of administering phone operations in the country and on their website you can learn more about codes, carriers and other information.
Use of mobile phone
The use of a foreign phone in Brazil depends on the technology used and the compatibility with Brazilian operators. Check with your carrier for cell phone usage conditions in Brazil, because the service rates may differ.
In the landing page, you can also find tips and information specific to the destination you want to visit. Check the list of landing pages.
You can also contact Embratur for further questions.