I have tried EVERYTHING. I have an iphone 4 and haven't been able to hear people talking unless I put them on speaker phone; this has been going on for 3 months. That means I have to have a lot of NON-private phone calls when I'm out and about and a call comes in. The elaborate and ridiculous recommendations most of these well-intended, advice givers hand out over the Internet about fixing this issue; doesn't work. Yet, this simple one did!! I did exactly as Dustin said to do and the phone worked, fine, as soon as it powered back up. I will flag/tag this site so that if my phone calls are ever "muted" again, I'll know exactly what to do! Now... Dustin, can you help me figure out why my blow dryer stopped working last week? LOL