Chosen Solution
I have the Verizon iPhone 4s 16 GB model. The other day suddenly people couldn’t hear me talking. I can hear them fine. I looked at the parts ifixit offers and I don’t see anything that looks like it fixes this problem. Anyone have any suggestions and source for a fix?
fpressly, the mic is part of the dock connector. Replace it to change the mic. Here is the guide for it, and the part is available right here. Hope this helps, good luck.