Some mobile phones can be wireless charging, charging will automatically turn on, but some models of Apple mobile phones can not be wireless charging after shutting down.
Of course, the X series mobile phone can also be wireless charging, wireless charger is about palm size, black and white, put the phone in the middle of the charger to charge, placed between the phone and the charger magnetic bracket, magnetic protective cover and other objects, may reduce the performance of the charger, or damage credit cards, security signs, passports and smart keys inside the magnetic strip and chip. It is recommended to take out the items in the phone case and then charge it.
Of course, mobile phone shutdown can be wireless charging, wireless charging can be imagined as wired charging, but the line can not see it, it is done by air. If you understand it this way, of course, it is slow to charge when the phone is on, because the phone is still consuming some power when it is working. And some wireless charging, the current is very small, it is likely to open the machine but the power will decline.