Note: You can make emergency calls on a locked phone (see Call Emergency Numbers). A locked phone still rings, but you need to unlock it to answer.
nTo lock the screen, press the Power key on the right side of the phone.
nTo unlock the screen, press the Power key. Then, drag the lock to the outer circle to unlock your screen.
Slide Lock
Slide an icon to open the phone.
nTo set the slide lock, touch Apps
When the screen is locked, touch 
> 
Settings > Security > Screen lock > Slide. and drag to the outer circle that appears.
Pattern Lock
Draw a pattern to unlock your phone:
1.To set the lock pattern, touch Apps 
> 
Settings > Security > Screen lock > Pattern.
2.Follow the instructions to draw your lock pattern, and then touch Continue.
3.When prompted, draw the pattern to unlock the phone, and then touch Confirm.
If you fail to draw the correct unlock pattern on the screen after five attempts, you will be prompted to wait for 30 seconds before you can try again.
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