Hi. This morning I got into my 2010 Prius IV and the phone rang. It said "Private Call" on the display. My cell phone was on and in the car. When I tried to answer by pushing the connect phone button it just kept ringing. When I pushed the off hook button it stopped but then started ringing again after a few seconds. No messages on my cell phone. I turned the car off and back on and the problem is solved. Anyone have any idea what is going on?