FREE GPRS counter
Acording to the author of this freeware, LCMinutes is designed to monitor phone usage: how many free minutes, free long distance minutes, free SMS allowance, and free data allowance have been used? what is the current charge? Or for prepaid plan, what's the current balance and its expire date?
So as you see this can be quite usefull to avoid huge bills..
Download PocketPC or Smartphone version.