Will the phone case affect the phone signal?

The shell will affect the cell phone signal.

Especially those mobile phone cases made of metal or with metal parts. Metal materials will form electromagnetic shielding to block or weaken radio wave signals, including but not limited to cellular network signals, Wi-Fi signals and GPS signals.

If you are worried about the influence of the mobile phone case on the signal, it is suggested to choose a thin and nonmetallic mobile phone case, which can not only protect the signal, but also minimize the interference to the signal.