Jan 17 2013, 11:41 PM
I have the same Audio Problems with my Lumia 820. It seems to be a software problem in the noise reduction. There is no patch, but Nokia seems to work on it. The second mic seems to be near the camera on the backside. Try to use a bluetooth headset. Perhaps it works better.
Microphone of Lumia 820 not clear during calls, when used with casing
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