iOS 11.4 - Wi-Fi and Bluetooth no longer function

That's a dead link. That was a useful KB article, but Apple deleted it a couple of years ago.

My Bluetooth is working but all the devices are listed by their address not their names except for 3. (iPhone 8 plus)

11.4 Blue tooth will not turn on - permanently shows spinning icon - shows turn on hon home screen but nothing more

Im fed up with this issue. No Bluetooth speaker Option available. Considering letting go of Apple even thou all my 5 electronic devices areApple.

What???? Pay for support? For an issue that is Apples developers error? Nooooo way!

Try a hard reset.....hold the sleep(power) button and the home button at the same time....continue to hold until you see the Apple logo...then release the buttons. Additionally, you can try turning OFF both WiFi and Bluetooth...then turning them both ON. If you still have a problem, call Apple Support.

It was working before the upgrade so not a hardware fault, and you seem to be the only victim so it is likely some not so obvious setting got mangled. I think your phone may have a future. You have tried all the obvious user level things, it is time to consult the paid help. Contact Apple Support

Did a full wipe and reset thru iTunes. Didn’t fix it. Turned off Bluetooth and Cellular but left Wi-Fi on. That seemed to do the trick. Restored from my backup in iCloud and for the past 3 days, no issues. But I haven’t turned cellular or Bluetooth back on. So this seems to point to an issue with the radio code at least on the iPhone 6. I assume the Wi-Fi radio is a different part an/or uses different code. Wish Apple would do a better job of testing and be more responsive to fixing. I’m not a fan of Android but I’m giving Android phones a look. I can’t afford to have my phone go inoperative every time a new iOS is released.

https://support.apple.com/en-us/HT204324