Everything was going well; I have the latest firmware in my iPhone 4. Everything was going fine until this afternoon and then. No manip meantime, and suddenly, I no longer hear my caller or may speak in short; neither listen nor the microphone does work, without apparent cause. I even tried reinstalling everything, nothing to do. The only way: press the "speaker", and there can hear and speak again. Who can help me please for this problem of iPhone 4 microphone is not working.