Chosen Solution
Dear Friends. I have a very strange Iphone 6S microphone issue. When answering a call normally everything works fine. If i switch to loudspeaker the following thing happens : The caller can not hear me while he is speaking. It’s like a one way conversation until he stops talking. Then he gets audio from me again. I tested extensively and all 4 mics work on my Iphone 6S the loudspeaker also works fine. ( I covered each of the 4 mics and talked into them while recording video, voice memo, even while using facetime ) All mics work independently , they just can’t work together to cancel the speaker sound and capture my voice at the same time. The phone went thru IOS 12-13-14. Also did DFU mode reset. Enabled/Disabled Noise Cancellation. Nothing helped. Did you see anything similar until now ?
My suggestion would be to try a new charge port. They’re inexpensive and they’re an easy repair on these models. I know you tested the mics, but it wouldn’t hurt to eliminate any issues with the port.
