LG G8000 User Manual page 176

You can set the menu relevant to a call by pressing [OK] in this
menu.
If this service is enabled, you can accept a waiting (incoming) call.
Activating the corresponding service.
Deactivates the corresponding service.
Checks the status of the service.
You can send your phone number to the other party dependent on
setting this function.
If you select this, you can send your phone number depending on
two line service such as line 1 or line 2.
If you select this, you can send your phone number to the other
party. That is, your phone number will be displayed on receiver's
phone.
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