I have an lg3200, and my son somehow turned on the carkit feature, I have no idea how. He's done it once before, and I got it turned off, but even at the time I didn't know what I did! Now it's on again and I can make calls, but I can't receive them, only because I can't hear the ringtone! I'm not the only person this has happened to, apparently...
Ha ha! I figured it out! it's the docking port for the carkit, my son slobbers in it, all you have to do is clean it out with a clean toothbrush or something, and bingo! The rubber stopper fell out eons ago, guess there was a reason for it after all....
