And it's funny how quite a few times people don't realise how their conversation is perfectly audible (and even quite intelligible) outside of the vehicle due to some combination of either bad soundproofing/speaker placement and/or excessive interior volume levels.
My phone connection is screwed up in my 2012 Honda Civic so all the caller hears is a high pitched screeching sound. I have not found a way to turn off calls on the Honda system or on my iPhone and it's so frustrating! Especially when calling out because you can't switch to using the phone's speakers/mic until the call has been answered. This means there is always a 10-20 second bit of time where I have to shout my apologies until I can get it changed. Or I have to turn bluetooth off entirely and it takes a minute to get it connected again after my phone call.