facetime without camera

Start a FaceTime call. Once connected, press the Home button. That will suspend the video transmission and then you will be in voice-only mode. See:

http://osxdaily.com/2012/06/17/use-facetime-for-voice-only-calls/

Cover the camera lense? But other than that, it does not have a voice only mode.

I understand now how to reach level 6.... thanks for the valuable advise!