Lock the keys and touch screen
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
and
Phone
>
Phone mgmt.
>
Auto.
keyguard
.