LG LGL39C - Manual (Page 8)

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3. Before installing an open source application and
operating system (OS)
WARNING
If you install and use an OS other than the one provided by the
manufacturer it may cause your phone to malfunction. In addition, your
phone will no longer be covered by the warranty.
WARNING
To protect your phone and personal data, only download applications
from trusted sources, such as Play Store. If there are improperly installed
applications on your phone, the phone may not work normally or a serious
error may occur. You must uninstall those applications and all associated
data and settings from the phone.
4. Using a screen lock
Set an unlock pattern to secure your and prevent unauthorized use. From the Home
screen, tap
> Apps tab (if necessary) > Settings > Lock screen > Select
screen lock > Pattern. This opens a screen that will guide you through how to
draw a screen lock pattern. You will be prompted to create a Backup PIN as a safety
measure in case you forget your screen lock.
Caution: Create a Google account before setting a screen lock and remember
the Backup PIN you created when creating your screen lock.