Here are a list of things you can do to troubleshoot Bluetooth issues on your phone:

1. Ensure Bluetooth is turned on.
2. Make sure the device you are trying to connect to is compatible with your phone.
3. Ensure the device is in range.
4. Make sure the device is discoverable.
5. Turn the device Off and then On again.
6. Restart your phone.
7. Remove Bluetooth connection from other devices
8. Delete the device from paired devices list and try pairing again.
9. Reset network settings (this will delete any Bluetooth pairing and Wi-Fi settings).
10. Update the device’s firmware.