If you have enabled Android Device Manager on your device, you can reset your password from the [http://google.com/android/devicemanager|Device Manager website]. Follow these steps:
* Log in to Android Device Manager
* Select your device
* Select 'Lock'
* Enter a new, temporary password for your device and click 'Lock'
* Enter the temporary password on your device
* Go to your lock screen settings and disable the temporary password you created.
If this doesn't work or you do not have Android Device Manager enabled, you will probably have to do a factory reset. Follow kris's instructions or check out the [[Trio Stealth G4 Troubleshooting|troubleshooting guide]].