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Disable microphone noise suppression and see if it helps.
So, 1 year after all that complains and they did nothing to fix this issue. Every time I have to talk loud even with noise reduction off otherwise they can't hear me!
I now many people with Z2 and we all have the same problem, we have to turn off noise suspension for the others to be able to hear us during calls and again, not very clear. weird thing is that this occurs only during normal calls, not skype, viber etc. Tried repair via PCC, still nothing, the others did the same so it's a software issue! Please forward this complain to the developers!
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