Secure your phone
Set screen lock
Depending how you use your phone, you may want to set some form of automatic screen lock to prevent unauthorized access. If a screen lock has been set, the screen locks when your phone's display goes to sleep.
To adjust your phone's lock settings:
1From a Home or All Apps screen, touch the Settings icon 
.
2Touch Personal > Security > Screen lock.
3Touch the type of lock you want and follow the onscreen instructions.
If you have previously set a lock, you must enter the pattern, PIN, or password to unlock the lock settings.
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