Hi. It's my second iPhone 6S now within a week. On both of them there is a very tiny speck of dust or something. It's in the upper left corner in the black area (not the display itself) It's clearly visable when you put it up in a light or uses a flashlight. It's not a scratch but under the glass. The wierd thing is that it's located the exact same place on both of the phones. So what can it be? Some tiny little screw or wire or is it some dust? And could i get eighter my money back or a replacement with this problem? Thanks, Thomas.