How do I lock the touch screen my Nokia device?

To lock or unlock the touch screen and the keys, slide the lock switch on the side of the device. 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 settings for automatic screen and key locking, select Menu > Settings > Phone > Phone mgmt. > Auto. keyguard > Keypad autolock period.