LG G4 User Manual page 146

NOTE
Create a Google account before setting an unlock pattern and remember
•
the Backup PIN you created when creating your pattern lock.
Caution! 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. But 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.
TIP! Smart Lock
You can use Smart Lock to make unlocking your phone easier. You can set
it to keep your phone unlocked when you have a trusted Bluetooth device
connected to it, when it's in a familiar location like your home or when it
recognises your face or voice or on-body detection.
Setting up Smart Lock
1 Tap >
2 Tap Display tab > Lock screen > Smart Lock.
Before you add any trusted devices, trusted places, trusted face, trusted
3
voice, or on-body detection, you need to set up a screen lock (Pattern, PIN
or Password).
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> .
Getting to know your phone