Fix iPhone’s Bluetooth Problems
If your iPhone 6s or iPhone 6s Plus fails to pair to your Bluetooth device, there are a few fixes that could help you repair the connection.
First, reset your Network Settings. Go to Settings > General > Reset > Reset Network Settings. Your device will forget your Bluetooth connections and you’ll now have to reconnect the phone to your various devices.
If that doesn’t help things, you’ll want to try forgetting the Bluetooth connection that’s causing problems. Go to Settings > Bluetooth > Select your connection using the circular blue i tab > Tap Forget this Device. Try pairing again.
If neither of those work, try resetting all of your settings. Settings > General > Reset > Reset All Settings. This process will take a few minutes and it won’t delete any of your data or files. That said, your settings will now be at factory defaults so you’ll need to spend some time setting things up again.