As many as 400,000 unlocked iPhones were running on China Mobile’s cellular network at the end of last year, according to market research firm In-Stat.

Apple sold 3.7 million iPhones in 2007, and more than 10 percent of them are in China, In-Stat said, attributing that information to China Mobile. That helps explain part of the “iPhone gap” created by the difference between Apple’s shipping totals for 2007 and the activations reported by its carrier partners in the U.S. and Europe.

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