The iPhone 3GS looks exactly like the previous model. It shares the shape and the same external controls, but the iPhone 3GS is unique in a handful of ways. You can get both memory sizes in white or black, and the iPhone 3GS display sports a fingerprint-resistant oleophobic coating that is supposed to attract fewer fingerprints and smudges. The new model shares the same dimensions as its predecessor, but it's slightly heavier (4.76 ounces versus 4.7 ounces), a virtually unnoticeable difference.
