I had a iPhone 6+ with Bluetooth that functioned perfectly, connecting my phone, my Cardo Packtalk, my Max 360 radar detector and Escort Live app, a Tune2Air dongle, and Garmin Smartlink for my Nav V and later Nav VI and the audio system on my GT together. I upgraded to an iPhone 7+, which also functioned perfectly in the Bluetooth department. Had an unfortunate situation with the 7+ and got a 6+ from my company’s IT dept that had previously been used by a now separated employee to tide me over until the iPhone Xs came out.
In setting up that phone, Apple insisted that I upgrade to iOS11. From the start, I had numerous Bluetooth issues. I could only intermittently connect to some of my devices and those connections were iffy. Connections dropped while others froze. I was beyond frustrated and, at the time, was unaware that the problem was with the update. So, I spent hours over many days and worked to reboot and unpair and re-pair one device after another over and again to try to get things going right again. I even went so far as to buy another Tune2Air, thinking that mine might have broken and was the cause of the problem. I also swapped the iPhone 6+ for another 6+ that my IT Dept had with no change in Bluetooth performance, or, better stated, lack thereof.
Two days ago, the iPhone X that I had preordered arrived. I wasted no time in setting it up and pairing it to my various devices and testing them. During the setup, I tried to skip the “update to IOS11” step, but found that to be not possible. Nevertheless, I am happy to report that all of my Bluetooth connections now seem to function perfectly as they once did before iOS 11 came out.
So, my take here is that the update to iOS 11 does not impair Bluetooth functionality on the iPhone X but does screw up that functionality on iPhone 6s. Not having had an iPhone 7 or an 8 with the iOS 11 update I can’t speak to what iOS 11 does to them. Will there be a fix for iPhone 6 owners anytime soon? Could it be that Apple is trying to force people to upgrade to the X? Can’t say; but I can say that of all the features that the iPhone X has that other models don’t, for me, by far, the best feature is that the Bluetooth connectivity of the X works like all the othe models did before Apple screwed them up with the iOS 11 update. That alone made the unreasonably high cost of the X worth every cent!