I recently purchased a i9000 and the voice quality over the microphone is horrible. The sound is muffled. Person on the other side of the line cannot make out what I'm saying. Is there a fix?
I had the same issue this week. Did the switching off of noise reduction and finally rebooted completely but still same problem. In desperation I stuck a pin in the tiny mic hole at the bottom of the phone and waggled it about... Hey presto! All sorted!
I had the same problem and was reading all of these posts about clearing cache, system resets, etc, etc. Then I read your post. Sure enough, there was some gunk over the speaker hole. Cleaned it off and everything was fine.
My husband's S3 keep restarting and wouldn't boot. I took it to two different people and both of them said, hardware failure - you need to replace it.
Since I had pretty much nothing to lose that that point, I took the back off, got into the area where the button was, worked it back and forth a few times, cleaned the case around the button, put it back together and the thing booted up perfectly. That was over a year ago and it hasn't given him a problem since.