Exactly the same problem. Cannot talk thru microphone in regular fashion, because makes me not audible. Talking on speakerphone makes me audible for my caller, but I can almost not hear them! On headset I can speak to callers. Have reset factory settings, tried starting in Safe mode, repairfunction of Xperia Companion did also nothing. Strange, is common enough problem since 2012. If I have to give phone for repair it will cost me 50 euros for examination only! (regardless of fixng phone) I just bought phone three months ago, and am not amused by these extra costs!
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