The Light Phone II includes Bluetooth (4.2), however, it is OFF by default.
Settings > Bluetooth & Wifi > Bluetooth > Toggle ON
Look for the device you would like to pair to appear under "other devices" list. Click to select the device that you would like to join. If there is a code required you will be prompted to enter it.
Forgetting a Bluetooth Network
While connected to a Bluetooth device you can forget the device by clicking on it's name right below the Bluetooth toggle. You will see an option appear to "forget the device".