Find "Phone lock"
Press the Navigation key.
Scroll to Settings and press the Navigation key.
Scroll to Security settings and press the Navigation key.
Scroll to Phone lock and press the Navigation key.
Activate or deactivate
Highlight When switch on or Off and press the Navigation key.
Key in the phone lock code (default is 1234) and press the Navigation key to activate or deactivate the phone lock code.
Exit
Press Disconnect to return to standby mode.