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Battery Life The i Phone 4 has one of the most impressive battery life specs in the smartphone industry.
Camera While the Droid X has a higher megapixel camera, 8MP to the i Phone's 5MP, the i Phone is the clear winner here for one reason: it has a front-facing camera.
The Droid X battery is larger than the original, but the processor is also faster, meaning it can use up more power faster.
Early tests indicate the Droid X battery does perform as good or slightly better than the original DROID's, which is definitely good but might not be good enough to match the i Phone 4.
Network The i Phone 4 is available on the AT&T network, which is notorious for dropped calls and poor i Phone traffic management in metropolitan areas.
The Droid X, on the other hand, is coming to the Verizon network, which has proven far more reliable with smartphone traffic.