3G Traffic Lite is the best choice to count mobile internet traffic and save battery.
-Save battery (doesn't do anything in the background)
-Show received/sent bytes (current and total)
-Reset current traffic when need
-History that shows the date and size when traffic was reset
-User friendly, simple user interface
-Supports ENGLISH and HUNGARIAN
Note that these are not official stats from suppliers. These are system stats.
It may not work with Samsung devices!! It was tested on Sony Ericsson Xperia Neo, Arc S, Mini and ZTE Blade.
If you are interested in Pro, see in-app instructions.