Chosen Solution
Callers on the other end are saying they can’t hear me, so I think I need to replace my microphone. I tried replacing the speaker because I thought the microphone was connected to that, but it did not work. How do you repair the microphone in the iPhone 4?
i fixed it… you just need to replace the dock connector, it has a mic soldered on… iPhone 4 Dock Connector Replacement
iPhone 4 Teardown.. from looking at the teardown the 2 mics are 1) on the dock at the bottom, 2) attached to the proximity/light sensor at the top. take a look then go and google or ebay the part..ie proximity or dock.
