3G Watchdog checks periodically with the Google licensing server that the copy is legal. The period is automatically determined by Google and is around 1 or 2 days. When it happens, you need to beconnected to the internet (via either a Wifi or mobile connection). If you get the message “Your 3G Watchdog Pro license could not be validated”, make sure you have a connection, and try again (several times if necessary) to start the application (maybe the Google server is temporarily unavailable, although this is rare), usually the problem resolves itself after a few attempts. Contact us if it is not the case.
You can also try to restart your phone (if not already done). If you just installed the application, you can also uninstall the app and download / install it again from Google Play.
We are sorry for the inconvenience but that’s the way the Google licensing mechanism works. This problem occurs sometimes but is usually easily fixed by starting 3GW again (contact us at firstname.lastname@example.org if it is not the case). You will not have lost any usage information.