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Hello,
Do you know why microphone in Z1 is very weak? I call quite a lot via Viber/Whatsapp and the caller always complains about my weak voice when I'm screaming almost.
Caller is using iPhone4/5 and I do hear them very very well. Is it something related only to Z1?
Noise reduction is OFF in Settings. I' running on 5.0.2
You should contact the app developers and report this issue, the app it's probably using the noise cancelling mic instead of the main mic