The glass casing of the iPhone 4 and iPhone 4S made it less prone to scratches, though it was susceptible to cracks.
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To prevent damage to the camera's lens, a resin ring as been added around the glass casing to ease shocks to the lens area.
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The AMOLED screen casing is constructed using a dual-injection molding process and tempered glass and results in a smooth, durable and scratch-proof surface that is aesthetically pleasing and enjoyable to the touch.
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The glass front is entirely flat, and sits flush with the polycarbonate casing -- unlike the slightly protruding, curved screen edges of the 8X.
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