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Except when on a phone call, from any screen, press POWER key (immediately).
While not on a call, to lock your control buttons and screen from accidental touch
activation, press POWER key.
You can increase the security of your phone by setting Screen unlock pattern. Once
set, in order to unlock your screen,
you‟ll have to draw the correct unlock pattern. You
can set your screen unlock pattern as follows:
1. On the Home screen, touch and select Settings.
2. Select Security and then scroll down to Screen lock pattern section.
3. Set or change your unlock pattern by selecting Screen lock pattern, as applicable.
4. Follow the prompts to define your pattern.
Note: You must swipe your finger along the screen to create the pattern, do not select
individual dots. Connect at least four dots in order to create a lock pattern.
If you want your pattern to be hidden as you draw it, clear „Make pattern visible‟ check
box.