Very few people have unlimited data for their iPhone, so a tool like Data Usage is very useful, showing you quickly how much you've used and how close you are to your limit.
Data Usage provides only what it promises to show you. There are two readouts on the screen--one shows how much data you have used and the other shows your limit. You can change either number with the tap of a button and the graphic at the top will show you visually how close you are to your limit. In tests, the meter proved to be fairly … Read more