Is there a iPhone App to show how much data your using?

There used to be a option in the settings on the original iPhone, it had a track bar that showed how much data you were using but now iPhone just sends you a text when your Data is almost up.
So what's the best app to track data?

10 points best answer

I've been looking for one for quite a while as well. For now, I just downloaded my carrier's app (I use verizon) and track my data that way