Find "Reset phone"
Slide your finger down the display starting from the top edge of your phone.
Press the settings icon.
Press the settings icon.

Press Backup & reset.

Press Reset phone.

Restore factory default settings
Press OK.

Press OK to confirm.
Wait a moment while the factory default settings are restored.
Follow the instructions on the display to set up your phone and prepare it for use.
Wait a moment while the factory default settings are restored.
Follow the instructions on the display to set up your phone and prepare it for use.
