08-02-2013 03:22 AM - edited 08-02-2013 05:01 AM
That was exactly my problem. People could not hear me if I used internal microphone. "Loudspeaker" and bluetooth worked well. I have tried to do factory reset several times. I have tried to downgrade OS to 10.0.0.95. I have reflashed it with 2 new leaked OS versions of 10.1. I have even tried to flash it with experimental 10.2
Nothing helped. Then I have given up and sent it to repairs. Luckily here in Germany T-Mobile is more efficient and they have given me replacement after 2 days. I have never used any case with my phone. So, I'm not so sure that this is not a hardware issue.