No sound during phone calls
My iPhone 7 plus has no sound during phone calls. Nothing comes out of the speak and the loudspeaker option is greyed out so I can't even use that. Occasionally when the sound does work, the other person cannot hear me either. I've tried using Siri to see if there is a problem with my mic and this didn't seem to work either. How can I fix this?
iPhone 7 Plus, iOS 13