How do I mute/unmute iPhone 6 plus
Suddenly I can't make receive calls. Internet works. I place a call; I don't hear "ringing." Call times out after 30-60 seconds. Someone calls me; phone rings; I hear nothing. I call person back (from another phone) and they tell me the phone rang, but no one answered (dead air).
I Suspect there is a mute function I am overlooking that has gotten set inadvertently. Help.
iPhone 6 Plus, iOS 9.3.1