For me, my F150 with ford sync doesn't work reliably with iPhone 6. I've reset all network connects, wiped ford sync, and can make it work but after a few hours it breaks again. The symptom is basically calls get dropped when the other party answers or if you answer an incoming call. I think it has something to do with continuity...the multiple devices that show up under bluetooth based on your iCloud devices. When ford sync is the only paired device it works but as soon as my MBA or iPad pair up then ford sync breaks. This correlation is a little weak at the moment since I've only been trying to fix this for a couple of days now. Search the internet shows this not to be just a ford problem. I'm curious what people here have found with hand free vehicle operation.