Very unlikely to be a hardware problem. Usually it's a user error e.g. not holding the phone close enough to your mouth or using the phone in very loud environments.
Try using the phone normally i.e. not in speaker phone mode where performance is worse and you annoy everyone within earshot. You can also try disabling noise reduction in the settings menu. Infrequently you may have water, dirt or your finger (when you hold the phone) obscuring the microphone hole on the bottom of the phone.
It's also possible to tweak the mic volume in the service menu /audio submenu. A forum search will explain the details if you wish to try that.
Happy to report I solved my low mic. problem!
Unfortunately it compromises the waterproofing, but I gladly sacrificed it!
I did poke in the microphone hole with a tin wire about 3-4 mm into the hole. I did not feel any resistance, but apparently I broke the waterproofing membrane on the microphone hole.
Now people can hear me even when I am whispering! I am so happy with my phone! (at one point I was thinking of replacing it because of the muffled mic.!)
The membrane I am talking about can be seen on the middle frame over the mic. hole on the attached picture.
Please if you do what I did - be careful, it might damage the microphone...
Good Spot!!! thanks for sharing the trick. I am having the same problem with my and I wish to follow your procedure in my phone.
Please provide more information with detailed steps and screen shots because I'm little confused in figured out microphone hole why because found two holes in bottom and top of the phone. I knew its my own risk and don't consider about waterproof.
Thanks in advance...
Your primary microphone is the one on the bottom - next to the USB port (the top microphone is used for noise cancellation and you can leave as it is). You only need to poke the bottom one. Be gentle - if you feel resistance - don't push (I did not feel any resistance as far as I can remember). Test afterwords and see if there is an improvement - if not, try to penetrate little bit further (I believe I went something like 3, maybe even 5 mm in).
Best way to test - if you have another phone and call it on Viber (I did that with my wife galaxy S4 mini). And leave your next to a radio set with talk show on.
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