Microphone issue Samsung GS2
Dude, I had same problem with one of my device few months back. What i did i kept reseting my phone to factory level and it use to get fixed for a while. But later on it use to give me same problem. Then i restarted my phone safe mode and tried testing the mic. It was working fine, then i uninstalled all unnecessary app. That fixed my problem. Please give it a try. If that doesn't work for you. Try reinstalling your phone's OS yourself or go to the service center. That will surely fix your problem.