Data Counter (v1.0-3) released on cydia

Data Counter allows you to keep track of your cellular data usage. It’s good for those who have limited data volume per month etc.
Features:

* Allows you to count the data usage based on a few filters: -by data type (sent/received/both), by period
* Allows you to define your monthly data plan
* Allows you to select the day of the billing month (so the period will be updated automatically everything your run the app)
* Not affected by “Reset Statistics” in the settings app
* Show a statistics of the daily and monthly usage
* Allows you to set what you want to display information regarding data usage on the badge (data exceeded/received/sent/total data usage)
* No need to physically run the app everytime you reboot your iPhone
* Works with any teleco, app directly grab data from your iPhone

Download meter is free in the app store and tracks wifi too. All same configuration options except for a icon badge. So check them both out to see which suits your needs.

just call *3282# at&t tells you haow much data you have left and how much you used