Amazing, until yesterday!!!
Way more accurate than any "usage app" carrier can provide! It was the best app of its kind, now they turned it into an ever better application. Look at the overall satisfaction, cant go wrong!
Jan 15, 2015 update:
Do NOT apply most recent version, has bug with enormous faulty data usage, stick with "old" version.
BlackSmurf76 about
Data Usage, v5.7