I can't hear the caller during a phone call.
I have an iPhone 4. I was on a phone call and all of a sudden I could no longer hear the caller. I reset my phone and checked all the settings, but I still cannot hear the caller. The caller continues to hear me. If I turn on the speaker phone, I can hear the caller, but as soon as I turn it off, I hear nothing. Any ideas or suggestions on what I can do to fix this. Thank you!
iPhone 4, iOS 5.1.1