Bluetooth not connecting on iPhone
iPhone Bluetooth is not connecting with any of the listed or not listed devices
[Re-Titled by Moderator]
See this support document for instruction on pairing your iPhone to a 3rd party accessory. Pair a third-party Bluetooth accessory with your iPhone or iPad - Apple Support
If you have difficulty or cannot pair, see these troubleshooting steps. If you can't connect a Bluetooth accessory to your iPhone or iPad - Apple Support
If you continue to have problems, you will have to explain what troubleshooting you have tried, any error messages you receive, what exactly is happening.