Hi Everyone, I am having an issue with my iPhone 4S 64GB Black during calls while using my earphones. A short while into the call you hear a lot of static (white) noise and the person the other end hears a lot of echo. You have to hung up and redial to continue the conversation and repeat process as needed. I have restored my phone twice now as a new iPhone and tried several different handsfree wired earphones all with the same results. Any advice? Thanks Simon.