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1st SYNC with laptop after just switching from ATT to T-Mobile AND iTunes dialog pop up box asks "An update to the carrier settings for your iPhone is available. Would you like to download it now?" ...so should I download it...or will that download mess u

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    1st SYNC with laptop after just switching from ATT to T-Mobile AND iTunes dialog pop up box asks "An update to the carrier settings for your iPhone is available. Would you like to download it now?" ...so should I download it...or will that download mess up my NEW T-Mobile service??

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