I've been using this lock with iPhoneX/8's for more than a year now and, for the most part, everything's peachy. Typically, the auto-unlock happens anywhere from 5ft away from the door to maaaybe 5 sec after arriving at the door. Manually unlocking via the app is instant 95% of the time. Other times it takes a couple of seconds, but that's fine. The Apple Watch app, however, is hit/miss. My 3rd gen, and also 4th gen have worked pretty much every time without concern, but my wife's 3rd gen has never been reliable. It's not the worst thing, but it would be nice to go check the mail or something and not worry about getting locked out of my own house because I left my phone inside.