Hi everyone,
I wanted to post my experience on the forum. I bought a Lumia 920 on December 1st. Everything was fine. I used it for a couple calls and people said they could not understand what I was saying. It was though I was breaking up, distorted, or talking in a tin can. Now, a week in. I have noticed everything is fine when I record sound through video, use apps (e.g. voice recorder), or even use speaker phone. So, the only issue I have been having is my outbound call quality is bad when not using speakerphone ( I assume that involves the primary microphone at the bottom of the device) So, today I decided to diagnose the issue as best I could. I turned off LTE using the ##DATA# menu, with no change. I then dropped it to 3G with no change. Finally, in desperation, I dropped it to 2G with still no improvement in outbound quality. I removed my screen protector, but, again, no luck. However, due to my exasperation, I was leaning forward on my arms while talking to friend, and he said he heard me clear as day. So, I fiddled with the angle of the phone. It appears that if the phone is pointing in towards my mouth, with my cheeks pressing against it, the mic is distorted. But, if the phone is held at an angle such that it is parallel with my mouth, the call quality is fine.
TL;DR Version:
If my phone is angled towards my mouth, outbound call quality is awful. If the phone is held parallel to my mouth, everything is good.
So, with that in mind, can anyone confirm this phenomenon? Fiddle how you hold the phone and see if it increases your outbound call quality. It could be that pressure is moving the primary mics, or something to that effect. I am not an engineer, so I have no clue how this magic box works.
P.S. Other than this issue, the phone is fantastic. It is a solid piece of hardware that is easy on the eyes. WP8, while still developing, is fast and dead simple to use.