Have found recently another problem that i have tried to fix in numerous different ways, when using Bluetooth for calling i cannot hear anything and the person on the other side cannot hear me, i have tried calling in safe mode using Bluetooth and no luck after using a few different developer options to do with Bluetooth still nothing will work, problem occurring on a S21 FE, this is getting annoying because this is not the first problem im having a problem with this phone having a problem with WiFi not working, check my other post for details on it.