Perhaps a Google search next time
Restore phone to factory default settings
Restoring your phone can be useful if you lend out the phone or just want to restore your phone to factory default settings and delete all user data.
To make a soft reset to delete user data, such as contacts, messages, and downloaded games:
1. Tap Dialler and enter *#7780#.
2. Tap Yes to restore all original phone settings.
3. Enter the lock code (0000 by default) and tap OK.
4. The phone restarts.
To make a hard reset to delete user data and all settings:
1. Tap Dialler and enter *#7370#.
2. Tap Yes to restore all original phone settings.
3. Enter the lock code (0000 by default) and tap OK.
4. The phone restarts.
