Errors in network settings can also cause Bluetooth and other important functionalities to clash. This is especially true if the new update instantly replaces your current network settings. Follow these procedures to reset network settings on your iPhone 8 to clean away any network issues and faults impacting Bluetooth:

1. From the Home screen, choose Settings.
2. Select General.
3. Restart by pressing the Reset button.
4. Select Reset Network Settings from the drop-down menu. This will cause your phone's existing network settings to be deleted and the default network values to be restored.
5. To confirm the action, enter your passcode if requested.
6. Then, to confirm the network settings reset, press the choice.