Ever since getting my iPhone 4 back in mid August ive noticed there is echoing when I talk to someone and I can hear myself say the words in my ear piece.. It's driving me insane. Now this happens to no matter who I talk to so its not person/phone/signal specific. Usually I have atleast 3 signal bars showing on the phone. It happens with people that are on a cell and that are on a landline. Its pretty annoying hearing myself over say the words.. Any of you other guys experiencing that? Also what can be done to fix this?