Find "Location and security"
Press Location and security.
Choose one of the following options:
Activate phone lock code, go to 2a.
Deactivate phone lock code, go to 2b.
2a - Activate phone lock code
Press Set unlock pattern.
Press and drag a point to connect at least four points.
Repeat the selected phone lock code to confirm.
2b - Deactivate phone lock code
Press Require pattern to deactivate the phone lock code.
Press and drag a point to connect the points in the existing phone lock code.
When the box next to the menu item is empty, the phone lock code is deactivated.
Press the Home key to return to standby mode.