On January 29, 2012 Brazil's National Telecom Agency (ANATEL) announced a change in the country's numbering plan. Starting July 29, 2012 mobile telephone numbers will be gradually added digit 9 after the two digit area code and before the current eight digit local number. The change will be implemented only in area code 11 (Sao Paulo Metro region) on July 29, 2012. We will post the dates for further implementation in other areas as soon as we get them.
We have received some reports that the aforementioned change is already active for Sao Paulo mobile numbers (if dialing to Sao Paulo cellular doesn't work the old way try adding the 9 as you can see in the example below).
Sao Paulo cell phone numbers 11 ???? ???? become 11 9???? ???? after july 29, 2012.
See our page on dialing to Brazil for complete details on calling to this country.