LG G8000 User Manual page 215

The Call barring service prevents your phone from making or
receiving certain category of calls. This function requires the call
barring password. You can view the following submenus.
The barring service for all outgoing calls.
The barring service for all outgoing international calls.
The barring service for all international outgoing calls except home
network.
The barring service for all incoming calls.
The barring service for all incoming calls when roaming.
To activate the function, press
To cancel the function, press
After selecting the function, press
You can cancel all the call barring services by pressing the
key.
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[On].
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[Off].
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[Option].
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