Restore Default Settings - Samsung

Note Restoring default settings reset Sound, Display, Phone and Call Settings to factory defaults. All user data (e.g. contacts, pictures, videos, and music) remain intact.
  1. With the phone open and from the main screen, press OK to choose Menu.
  2. Select Settings & Tools (Settings) then press OK.
  3. Select Phone Settings (System) then press OK.
  4. Select Security then press OK.
  5. Enter the lock code.
    Note The default lock code is the last 4-digits of the mobile number.
  6. Select Reset Phone / Settings then press OK.
  7. Ensure that Yes is selected then press OK.