LG LGD851TN - Manual (Page 9)

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4. Using a Screen Lock
Set a screen lock to secure your phone. To set the screen lock, follow the
process below.
From the Home screen, tap > > Settings > Display tab > Lock screen
> Select screen lock and select a desired screen lock from None, Swipe, Face
Unlock, Knock Code, Pattern, PIN and Password.
NOTE: In case that you have trouble with Face Unlock, you can unlock the
screen a Backup Pattern or PIN.
Warning! Take precautions when using an unlock Pattern, PIN, or Password.
It is very important that you remember the screen unlock information you
set. You are allowed 5 attempts to enter your screen unlock information. If
you used up all 5 opportunities, you will have to wait 30 seconds to attempt
unlocking the phone again.
When you can’t recall your Unlock Pattern, PIN, or Password:
If you logged into a Google account on the phone and failed to use the correct
pattern 5 times, tap Forgot pattern? You will be required to sign in with your
Google account and prompted to create a new unlock pattern.
If you have set a backup PIN, you can unlock the screen with keying in the
backup PIN.
If you haven’t created a Google account on the phone and you forgot your PIN,
Password, and the backup PIN, you need to perform a hard reset.
Caution If you perform a hard reset, all user applications and user data
will be deleted. Please remember to back up any important data before
performing a hard reset.
Important notice