I just got an Iphone 7 and travel a LOT. This weekend, EVERY call I made was dropped multiple times (I drive a 2014 Ford Escape with Ford Sync) and sometimes it would drop it entirely, sometimes music would cut in on the call, and sometimes it was deadspace. I need to either fix it now, or go back to my old iphone 6, which worked flawlessly with the ford sync.
iPhone 7 and newer connect to vehicles via Carplay, so you’d need a audio system compatible with that. Ford put Carplay compatibility in Sync 3 on 2016 and newer Edgs models.