I got a series 4 Cellular a few months ago. For some reason, the microphone has just stopped working. I used talk with text quite often, and it happened quite suddenly. I have tried all electronic methods (unpair re-pair, hard reset, etc), but still have the problem. I thought maybe it could be water damage (although the only water exposure it has had would just be from me to wash my hands) so tried the water trap but still didn't go. Has anyone else had this problem, and if so, is it covered by warranty? No apple care, btw.