I purchased a 2016 c300 Mercedes never dreaming it only had voice activation for the navigation only. My 2014 Cadillac had voice activated calling. I'm so floored that I never dreamed the car would not have it. I really want voice activated calling. Trying to turn the knob and scroll through a contact list is a nightmare. I have seen some suggestions that you can get Siri/Bixby by pressing the voice button for a longer time and you will hear a different beep which will connect to your phone. I have tried this several times and it does not work. Do you have any suggestion?