Unlike the move from the iPhone 4 to the iPhone 4S, which saw both devices use essentially the same design, it's immediately clear from looking at it that the iPhone 5 is different from the iPhone 4S. The most obvious reason for this is that it's taller, thanks to its 4-inch screen (as opposed to the 4S's 3.5-inch display). But there's more than a larger screen that sets the iPhone 5 apart from its predecessors. There are a number of under-the-hood improvements that make it a solid upgrade. 

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