Microfone problem

[giosouza]

 I bought my Xperia C4 twenty days ago. There is prolem with the microfone. no one can hear me, calls are very low and wheezing. Can you help me?

[Uliwooly]

@giosouza

Settings > about phone > diagnostics > test > test microphone

[giosouza]

 Is all right in the test. The problem is during calls. 

*** Sorry, my english is very ridiculous... rs

[Uliwooly]

@giosouza

Is this during regular calls or VOIP calls?

[giosouza]

During regular calls. 

[Uliwooly]

@giosouza

Settings > calls > microphone noise suppression > off

[Phy]

Check if you encounter the same problem while on safe mode.

How to boot on safe mode
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008

How to boot on safe mode on Lolipop
1. press and hold the power key
2. once you get the pop up menu 
3. press and hold "power off" 
4. Boot on safe mode should become available

[John-BR]

Hi @giosouza

Welcome to the community.

Some other options to try would be:

Going to Settings > Apps > All, then find the Phone application, then clear it’s cache and and force stop them to reset the program. If that doesn’t solve the problem go back through to there and clear the app data

[renatosilva]

I bought the M4 in November, in April she had a problem with the microphone, I took it to the service that repaired it, in June the problem returned. This time they claimed a loss of warranty due to a break in the loader.
What do I do to have my device in good condition?

GT