Iphone 4 mic
Not sure if this is the same as your Problem, but
I once had a problem with an iPhone where the person at the other end was responding, but they couldn't hear me. I Think the rain got into the microphone hole on outside of the phone during a severe storm & I needed urgentt help cause of the rivers flooding around me. (NorthWest Oz).
Murphy's Law - a phone will always break down when you need it the most!
As a temporary fix, I simply switched over to the speaker phone. The other person could now hear me OK.
(Use the hands free switch on the screen to turn the speaker on)
The iPhone has 2 microphones and it appears that only 1 was functional. It uses the second microphone in it's noise cancelling circuit. I guess it compares one input to the other to cancel background noise.
Anyhow, the iPhone came right the next day after drying out.
Hope This Proves Helpful to Others as well
What is Eco mode on phone?
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