Key Lock

You can use the keypad lock function to prevent unwilling key-in actions when you put the phone in a bag. In locked mode, you can still answer calls.
To lock, press Menu key and * key in idle, or select Menu > Settings > Security Setup > Auto Keypad Lock, select the time for the auto keylock and press Left soft key (OK). The default is 10 seconds.
When the keypad is locked, press Menu key and * key to unlock the keypad.