iPhone 4 doesn't ring, only vibrates, but speakers work.
My iPhone 4 (AT&T) suddenly won't ring when someone calls or I get a text, it only vibrates. The speakers play music fine, and I can have phone conversations and hear/speak to the other person fine. Also, the alarm clock sounds The mute switch doesn't seem jammed or anything, but when I switch it off, it doesn't show the picture of the bell with the line through it while vibrating to let me know its off. Also, the volume buttons get no response when pressed. Any ideas?
iPhone 4, iOS 5.1.1