LG H500f Guide De L'utilisateur page 423

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 work, or
when it recognises your face.
Setting up Smart Lock
Tap >
1
Tap Display tab > Lock screen > Smart Lock.
2
Before you add any trusted devices, trusted places, or trusted face, you
3
need to set up a screen lock (Pattern, PIN or Password).
Getting to know your phone
> .