This is so crazy-making. I use FaceTime a LOT to call my folks in England. Since upgrading to iOS 11 for the first time (PB5) on my iPhone 7 Plus, there are two pretty glaring issues. 1.) FaceTime will no longer transition from Wi-Fi to LTE/3G. It just loses the call. 2.) If you’re on a FaceTime call and a regular phone call comes in, your FaceTime call gets dumped. I really hope Apple is aware of this. Who even knows how this issue even came about..?