Just noticed this with my iPhone. It seems like one side has more of an edge or is less smooth. It's particularly noticeable when I drag my thumb off left edge of the phone and compare it to the right edge. The left edge seems to be rougher or noticeably more raised, or some other part like the screen is more lifted. Anyone else have this issue? I have a matte black iPhone 7, if it turns out to be specific to certain models. Yeah, it is a minor thing, but I did notice it without looking for it.