Hi, I decided to just turn it on after the manual said it would have charge & wasn't quite sure where we stood with the best way to try it. Anyway! When I got in, first thing I did was make a call and notice the mic issue. I then confirmed it with recording a video. For added info, mine is 15415 leaving out the last digit if that is right.
DO NOT CHARGE FIRST THEN TURN ON YOUR N900!