Reviewing the iPhone 3G for The Wall Street Journal, Walter Mossberg today said that the device ?mostly keeps its promises,? but is saddled by ?two big hidden costs:? weaker battery performance and AT&T price plans that ?effectively negated the iPhone?s up-front price cut.? On upbeat notes, Mossberg praised iPhone 3G?s data performance, which he said outstripped Apple?s clams of twice the prior?

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