I've concluded some elements on the LG V20, and will address hiss gate on iphone7/+ that no one seems to be analyzing, and to what is causing it.
First the Iphone7 because it is a thread on the missing 3.5mm jack-- and that is what's causing it! The fact that it is no longer using an analog controller for sound control/processing is the reason for the more than average s/n ratio when the volume is lowered. Think about it: with an analog control it levels evenly. Not the case with digital processing.
Now for the LG V20-- it is indeed including the B&O H3 headphones for US consumers But that's all I've got on the phone as of yet