To lock the touch screen and the keys, press the lock key on the side of the device.
To unlock, press the lock key on the side of the device, and select the unlock icon on the screen.
When the touch screen and keys are locked, the touch screen is switched off and the keys are inactive.
The screen and keys may be locked automatically after a period of inactivity.
To change the settings for automatic screen and key locking, select Menu > Settings and Phone > Phone mgmt. > Auto. keyguard > Keypad autolock.