You can set the keypad of your device to lock automatically after a preset time delay.
- Select Menu > Settings > Phone (or Phone settings or Device) > Automatic keyguard > On or Off.
- If you select On, Set delay: is displayed.
- Enter the delay time (in mm:ss format), and select OK.
To lock the keys manually in the home screen, press the left selection key and *.
To unlock the keys, press the left selection key and *.
When keyguard is on, it may be possible to dial the emergency number programmed into your device.