Special Characters Damage Wi-Fi Connections on iPhone and AirDrop
if you are going to connect your iphone to a wifi with a strange name that contains special characters, be careful because it may cause your device to fail.A series of faulty iPhones do not accept SIM, cannot connect to Wi-Fi, data after upgrading to iOS 12.1.4
after upgrading to ios 12.1.4 update, many iphones have failed to connect to wifi network or 4g, not even receiving sim.