Ok, boys and girls - I made it through the whole 20 pages of this thread (and keeping up with the deleting posts đ), just as Lawrence did and I too have some observations. đđ
First - I totally agree that there are several issues, that we are discussing here. However, most of us have problems with the bad call quality for the people on the other end of the line (in my case they said that I was becoming distant or just could not hear me). It is not clear though how often it occurs, as most people only report the "me-too" symptom. I can say that in my case I had only a few calls, when the caller said they could not hear me or I was dropping out. I must admit though that I had the phone for like 3-4 weeks and was not making a lot of calls (3-4 day, 1-2 min in length). I think that most of the problems could be resolved by realigning the phone (I have iPhone 7) so the microphone is closer to mouth - this improved the call quality. So Yes - "you are holding it wrong!" seems like the correct advice from Apple Support/Genus đ This issue would therefore be more related to the new noise cancellation protocols and the direction in which the microphones are working (ISSUE 1), as some suggested earlier.
Also - the Voice Memos test - I made the same recordings now with some music playing back from my comptuer on iPhone 7 and 6S. Of course on both you can hear some static humming sound (these are not microphones costing thousands of $), but the recordings from 6S are definitely better - both the music being played back, and the overall noise. On the 7, ALL the recordings are worse:
-the sound is very compressed so the music was difficult to distinguish
-the static humming is much more prominent - and this is most probably due to the microphone being set too sensitive (too much gain). This proves ISSUE 1 being software related. Though some others on this forum are not reporting any issues with this test - please, make sure to compare recordings made in the same conditions with a different phone.
In my case there was however the second problem - ISSUE 2 - a few times, especially when I was having a longer conversation the caller said that there was noticeable buzzing heard, through which they could not hear me. I thought that this must be a carrier issue or signal dropping, but then on 1 of my recordings I heard this buzzing come up, quite randomly. This could not be resolved by adjusting the phone - but in my case it disappeared during the call (only to turn up again and then disappear a few times). I am not sure what the cause could be, but this is also likely a software bug.
/also - updating to 10.2 did not help me with ISSUE 1 when testing Voice Memos/
On a general note, I do hope that this issue gets resolved. I will be doing more testing, and I plan to test also my father's new iPhone 7 - both on the call qaulity and the voice memos.
I am pretty sure that Apple is aware of this issue - from all the different sources reporting issues with phones, they must have this bug somewhere on their list. It might even get to the press at some point - I am curious if Andrew can get something across to the Apple bosses, who might contact him.