WeeTrackData is a tweak for iPhone and 3G iPad users, that shows how much data you've used in a time period you can specify, shows how fast your upload and download speed, and allows you to set what your data cap is. It allows you to program it to tell you how much data you can use a day, based on your billing data, and your monthly cap. This tweak is very useful for helping people from going over their cap, and for seeing how much you've already used.

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This tweak is available for $1.99 on the BigBoss repo.