My old Cadillac would automatically slow the fan whenever I made or received a Bluetooth call. Genius. My Model S and X both seem to just control the fan speed with no regard for anything else. I have set my right scroll wheel to control fan speed. I slow it down before I make a call, then push it afterwards to put it back in Auto. Problem with that is you can't do it when your in a call because the right scroll wheel is taken over for phone functions.