Microphone does not working during calls

[AP1997]

When I make or receive calls, the other person can not hear me. But when I put my phone on speakerphone, they are able to hear me. Any fix/solution to this problem. Please help and thank you.

 

[nahoku]

Many people (especially people who carry the phone in their pocket) find dust in the mic holes and use a pin to clean it out. Be careful not to insert the pin too deeply or you may mess up the mic.

 

[Saurabh Chandra]

Solution for me:
Microphone does not work during calls.
I am currently using Lenovo A7000a- Android version 5.0. I had the same problem for about 6 months. I installed many OTA updates, but none fixed it. During calls I could hear the other person, but they cant hear me. However, it worked fine for some time if i restarted my device. So every now and then, I had to restart my device. Also, everything was fine while placing skype calls or whatsapp calls or testing mic recordings. I knew it was a software glitch and the noise cancelling microphone was to blame.
I googled a lot, and scanned through different forums, nothing helped much. Like someone told that using the speakerphone would correct it, but it didnt worked either.I even rooted my device to alter the build prop to change the value of persist.audio.fluence, however, no such element was found in my build prop file
I did two things after doing a lot of research:
1. I cleared the data in Apps>All>Phone/Call
2. Disabled all the apps in Permission Control that had the permission to i)Record ii)Initiate Call iii)Initiate Multiple Party Calls iii)Write MMS (everything that could use your mic.. ofcourse except the system apps).
I am not sure what solved the problem. But now everything is fine with/without earphones with mic. PS: My Call Recording app may be causing this prob, but I am not sure.
My phone is working fine from the past two days...Thought to share my experience with everyone.
Hope that helps..