Mine is iPhone4. There are some different situations for mic. some works fine, but some fail. 1. receive or make a phone call -> mic works. 2. receive or make a phone call with speaker mode -> mic fails. (but I could hear the other side) 3. audio recorder -> mic works. 4. default build-in video recorder -> mic fails. 5. only FiLMiC Pro could record video with sound SOMETIMES, not always. (other app I have tried -> mic fails) 6. If I use mic of headphone, everything works. Speaker works normal for all situation. Any possible for this?