Warning: Resetting your phone will erase your phone completely. Remember to backup your phone information and settings.
From the home screen please press MENU, then tap Settings > SD & phone storage > Factory data reset > Reset phone.
You can also perform a factory reset by using the buttons on the phone.
1. With the phone turned off, press and hold the VOLUME DOWN button, and then briefly press the POWER button.
2. Wait for the screen with the 3 Android images to appear, and then release the VOLUME DOWN button.
3. Press VOLUME DOWN to select CLEAR STORAGE, and then press POWER.
4. When asked to confirm, press VOLUME UP.
NOTE: Resetting your handset to factory or manufacturer's default setting will delete all the data stored on your phone memory, please backup your files first. To backup all of your personal information on your phone, please refer to "How do I backup my phone".