Find "Phone lock"
Press Menu.
Scroll to Settings and press OK.
Scroll to Security and press OK.
Scroll to Phone lock and press OK.
Turn use of phone lock code on or off
Highlight On or Off and press OK.
If it's the first time you use the phone lock code, you need to key in a phone lock code of your own choice.
Key in the phone lock code and press OK.
If it's the first time you use the phone lock code, you need to key in a phone lock code of your own choice.
Exit
Press Disconnect to return to standby mode.