1.just go to the menu.
2.go to setting, then privacy
3.go to factory reset
4.go to reset phone.
5.and finally enter your password, then select yes to confirm.
1.turn off your phone, pull the battery out and reinsert it.
2.hold the volume down button
3.press and release the power button.
4.a menu will appear containing a list of option like fastbook, recovery, clear storage and simlock 5.select clear storage by pressing volume down button.
6.press and release power button again.
7. Finally confirm your decision you can choose volume up for yes and volume down for no.
If you selected yes, the phone will reboot to its factory state .