APN Br

Enable and Disable Your Data Connection via Widget on the Main Screen

Enable and simply disable your data network preventing your Android from connecting to the internet and using your ATOA data plan, it works independent of Brazilian operators (Claro, Oi, Tim and Vivo).

Also check out APN Br Pro that makes your life even more easier by having ads. Saving your pocket at the end of the month because it has not extrapolated your data plan and battery for not constantly with the 3G network on.