How to activate call divert on the LG GU295?

How is the "call divert set" placed on a LG GU295 externally and how can it be removed?

To enable or disable call divert, from the standby screen, press the left soft key [Menu] > Settings > Call > Call Forwarding.

The following options are available:
► All Voice Calls: Diverts voice calls unconditionally.
► If Busy: Diverts voice calls when the phone is in use.
► If No Answer: Diverts voice calls which you do not answer.
► If Out of Reach: Diverts voice calls when the phone

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