How to manage 3 g usage on an android device with 3 g watchdog<br>Download 3 g watchdog and appdroid from the android market (preferably over wifi). Open 3 g watchdog. Define your data plan's quota and starting date.
You can avoid overage of data on your device by understanding your plan's limits as well as the start and finish date.
Based on the statement above, by following the plans limits and when it starts and ends, you can manage your data usage.