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Disney has learned a harrowing lesson: Breaking into the wireless business is no Mickey-Mouse affair. Since it's too expensive to compete with the big carriers, Disney Mobile is shutting down. Instead, it will focus its efforts on licensing its Family Center suite, which provides services like child tracking and phone disabling, to other carriers. You'd think Disney would have already learned this lesson with its ESPN subsidiary's defunct wireless service, which found last year that it was too late to get into the game.