I purchased an iPhone SE about a month ago. This is 6s guts and camera in an iPhone 5 case. It is a very powerful phone.
But I soon noticed that when I called someone, I could hear them but they could not hear me. Muffled and garbled was the universal feedback.
I went to the Apple Store Wednesday two days ago on a walk-in basis and they said the wait would be 3 hours, and come back Friday (this morning) and they would fit me in. Store opens at 10:00 am.
At 9:00 am, I connected the iPhone to my Desktop and let it backup and sync. I have done this many times but I wanted a fresh backup. Completed.
At 9:15 my phone rings. It is Canada Revenue Agency about a client of mine. All resolved amicably. BUT, the phone call was normal. This is NEW.
Off to Apple and they run diagnostics and the person calls me, we switch phones on the same call and all seems well.
I call 2 people who had pointed out to me how much better my iPhone 4s was - much more crisp and clear. Verdict: All is well
So what happened. 3 guesses
1. Technician says I may be holding the phone incorrectly and blocking the rear microphone. Maybe but I do not think so.
2. I asked if iTunes would have updated firmware? He concurs that this is the most likely reason.
3. OS was somehow damaged and the most recent iTunes connection fixed it. Not likely.
I think Apple had a problem and they issued a firmware update.
Anyways all resolved at least for now