My third iPhone 3GS (the rest were exchanged due to various debris, including metal under the screen and scratches out of the box) came with a speck of dust under the screen. This wouldn't be as big of an annoyance if the screen backlight didn't light up the dust, and the dust also killed the pixel, so it looks black (and redish on some angles). I really don't feel like exchanging my iPhone 3GS again, but the dust is getting really annoying. I'm not a fan of Genius Bar screen replacements as I've been dissatisfied with a screen replacement before, which came with about five specks of dust under the glass and scratches and nicks across the glass, so I would really want to get another iPhone replacement if I chose to get this problem fixed. Has anyone ever kept an iPhone with dust under their screen? It can become annoying as a speck of dust can also potentially kill pixels and become something that you constantly stare at.