this problem just randomly appeared a couple of days ago and has persisted since then. When my headphones are plugged in and I get a call, the person on the other end cannot hear me. I'm using regular headphones without a mic. It I put the iPhone near my face and speak Into it and this has worked fine in the past. As soon as I take he headphones out I can talk on the phone as normal so the mic is not dead. Any ideas what the problem might be? incoming voice and all other sounds can be heard by me through the headphones