if Onstar come on while I am in the car I know. The Radio goes off and then a lil beep
if they have figured out how to listen to people while in the car without them knowing then all they hear from me is out of tune singing with the radio... potty jokes and a lot of quietness
But My Cousin works as a operator in another state and also has Onstar for himself.... he says they can not listen to us either. I grilled him(just bugging him) asking all kinds of silly questions about onstar.