Unlock screen
After a period of inactivity, the screen you are currently viewing will be replaced by the lock screen to conserve battery power.
Unlocking the screen
Press the Power/Lock Key .
Slide the screen any direction.
Setting up the screen timeout duration
1 From the Home screen, touch the Menu Key 
> System settings.
2Select Display.
3Touch Screen timeout and select the amount of time of inactivity after which the screen turns off.
NOTE
To lock your screen using the pattern lock feature, touch the
Menu Key 
> System settings > Lock screen > Select screen lock > Pattern. A short tutorial will guide you through the process of setting a pattern lock.
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