I was getting a bit bored with my almost one year old iPhone wallpaper photo that I took. So I went to Aperture, found another good picture, crop it portrait sized, since the iPhone screen is normally used in portrait mode, and synced it to the phone. This morning I look down on the locked screen, and realized that that top and bottom of my wallpaper picture is obscured by the time and the unlock control. Duh !! They designed that screen to display a (heavily) letterboxed landscape picture !!