My iPhone X makes a siren noise in phone call to 1 friends number but siren is turned off
My iPhone X makes a siren noise in phone call to 1 friends number but siren is turned off. Only 1 number seems to be affected. His phone is an old nokia. When it happens he can't hear me and I can't hear anything but this constant siren noise. I have to switch off completely and reboot. The other day I had to reboot 6 times.
iPhone X