I have an issue where most people I call cannot understand me. It doesn't happen all the time, but for the most part it does. I originally thought that my microphone was clogged with dirt, but since sometimes it isn't an issue, I'm thinking that dirt isn't the culprit. My wife usually hangs up on me in frustration saying I sound like the adults from Charlie Brown. Also, when I talk to people on speaker phone, it isn't an issue. Has anyone else had this problem? Should I just take it in to AT&T and try and get a warranty replacement? Thanks.