There is a reset method to restore the phone to factory defaults in case you have forgotten your pass code.
Make sure the charger is disconnected.
- Switch the power Off.
- Press and hold the Volume down and connect the charger, if successful an exclamation mark (!) is shown on the screen. Then input Keysin the following order:
1. Volume up
2. Volume down
3. Power
4. Volume down
The phone will now reset and boot up automatically into an out of the box condition and restored to factory defaults. (Credit to user CJlim for finding this reset).