I have SM-G800F with stock Android 4.4.2 updated from Samsung to the latest update I can get. Not rooted.
I have mic problem since I've bought this phone two weeks ago. People talking to me say that my voice is muffled as if I hold the phone too far from my mouth. This happens only using phone mic - if I switch to speakerphone or earphone during the call, everyone can hear me great. So, the problem is with the phone mic as if the mic level is too low .
I've searched all over the web and have realized that this is very common problem with S5 or S5 mini. As a solution, people suggest "cleaning" the mic hole which puncture the waterproof membrane of the phone and you loose warranty.
Another approach that could make progress is by editing default_gain.conf
file at root /system/etc/
(more at http://forum.xda-developers.com/show....php?t=2777535
) but for that to work you need to have root which also void warranty - correct?
Suggestions like taking out the battery or wiping the cache partition didn't make any improvement for me.
The only hope for me is hint the I've found the post (http://forum.xda-developers.com/show...14&postcount=2
) on this forums suggesting raising mic level gain setting in phone service menu could solve the problem but there is no explanation how to do it. I've tried to enter the service menu using *#*#0011#*#* and then Menu -> Back -> Menu -> Input Key -> Q -> Menu -> Input Key -> 0000 but service menu doesn't appear like it should.
Any suggestions either on how to enter the service menu or some other way of solving the issue?