Very perplexing software issue. I've wiped this 9900 about 8 times in the last 5 days, loaded current and previous OS versions. The fix works for an hour or two, then the microphone stops working again. It is out of warranty. I have spent several hours on the phone with the friendly people at BB tech support. I know this was a big issue a couple of years ago for ATT 9900 phones. This is a TMO, no damage, not wet, no funky apps ever installed, media card wiped and removed. I don't reload address book or other items, or sign in to BB ID. Anything I do besides dial or answer the phone makes the microphone stop working - sounds like I'm under water. But it will record video and voice notes with clarity.
I see lots of questions about this, but not a lot of clear answers. Anyone have any help for me? thanks!!!