Find "Activate phone code"
Press Menu.
Scroll to Settings and press the Navigation key.
Scroll to Security and press the Navigation key.
Scroll to Activate phone code and press the Navigation key.
Turn use of phone lock code on or off
Key in the phone lock code (default is 1234) and press the Navigation key.
Depending on the current setting, the use phone lock code is turned on or off.
Depending on the current setting, the use phone lock code is turned on or off.
Exit
Press Disconnect to return to standby mode.