LG LGL55C - Manual (Page 96)

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Silence Your Device from the Lock Screen
If you are in a place where your device's sounds may disturb others, you can
quickly silence your device from the lock screen.
●
Drag to the left. To turn the phone sounds back on, drag to the left.
Credential Storage Settings
You use credential storage to establish some kinds of VPN and Wi-Fi
connections.
To allow applications to access your device's encrypted store of secure
certificates and related passwords and other credentials:
1. Press > >
Settings > Location & security.
2. Tap
Use secure credentials. (A green checkmark will appear.)
To install a secure certificate from a microSD card:
1. Press > >
Settings > Location & security > Install from SD card.
2. Tap the file name of the certificate to install. Only the names of certificates
that you have not already installed on your device are displayed.
3. If prompted, enter the certificate's password and tap
OK.
Device Settings