The metal sheet at the back of the phone case is used with the stand. We know that there are many mobile phone cases on the market with a round small iron sheet behind, many small partners do not know what it is used for, in fact, this small iron sheet is used with the car mobile phone bracket, generally this car mobile phone bracket has a magnet, put the phone on it can absorb the mobile phone.
If the metal sheet behind the phone case is composed of coils, then the metal sheet is a wireless charging coil. If the metal sheet behind the mobile phone case is only a metal plate, it is used to prevent mobile phone radiation, and it can also be understood as a mobile phone anti-interference. What exactly is the role depends on the shape of the metal sheet.
The metal sheet on the back of the mobile phone motherboard is mainly designed for better heat dissipation of the mobile phone chip.