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Are all Apple iPhone 5s model A1533 unlocked?

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Yes, the A1533 is the unlocked version. See: iPhone 5s 16GB Gold (GSM) Unlocked Perhaps once that phone is put under contract to AT&T, then AT&T locks it to their system so that you cannot move to a different provider without swapping out the S... read more

Yes, the A1533 is the unlocked version. See: iPhone 5s 16GB Gold (GSM) Unlocked Perhaps once that phone is put under contract to AT&T, then AT&T locks it to their system so that you cannot move to a different provider without swapping out the SIM card. That could explain the discrepancy you've seen. read more

As noted above, three of the iPhone 5s models -- two distributed in the US and one distributed in China -- are the difficult ones to identify as they both share the A1533 model number. Consequently, if the iPhone will boot, the most convenient way to identify a specific A1533 iPhone 5s model is with the Order Number-- which Apple refers to as the"Model" within the iOS -- or by its Serial Number listed in software. read more

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