Now that I think about it, I carry my iPhone 4 in my pocket with the Apple Bumper case on it while I am not using it. I had a similar thing going with my 2nd Gen iPod Touch, which had a case that left only the dock and audio port exposed. My Touch, however, developed a bit of dust under the screen that I am sure came from carrying it in my pocket. Did Apple correct this dust vulnerability yet, or will carrying my iPhone 4 in my pocket result in dust buildup under the screen? Thanks.