It is best to unplug when the wireless charger is not used, because all the power equipment on the mobile phone will have a wire veteran painting, this situation, otherwise it will cause a fire, well, as long as the long time is not in, it is best to all the electrical equipment at home off the power, which is safer. I hope my answer can help you.
Need to unplug. The first is that it also consumes electricity (although very small), and the second is that long continuous work shortens the life (although not much). Especially when you're not with it, just to be safe.