First Method: power off the phone. press Volume Up + Power button. Now from the menu select option “wipe data/factory reset”, and accept this with Power button. After that confirm operation “yes” using Volume Down to scroll, and Power button to confirm. Afterwards press Power button to enter option “reboot system now”. Done and enjoy Second Method: Go to Settings click/press Device section Next Device information and now tap More information Tap Reset Phone and tap ok. It is done.