Just wondering if anyone has this issue. The microphone is really quite and muffled when using FaceTime, loudspeaker, and recording a video. It's fine for voice calls and voice memos. I think it's the mic by the headphone jack that is causing the issue. Anyway, I phoned Apple and they said it was an 'emerging issue' which means they have seen it before. I have to take it in and they will replace it. I didn't notice until just now, 2 weeks after getting the phone. I would suggest you check if you haven't used these features yet!