What do you mean by virtual phone?

Change the settings in Call Forwarding in Call Settings and cancel all call forwarding.

When you press the volume button in standby mode and pretend that someone is calling you, the virtual call begins. Sometimes it is useful when you are away. Of course, only the phone rang, and no one spoke inside. The content of the call depends on your performance. Don't worry, you won't deduct the phone bill. This is a very interesting function.