Although Apple has only said it would sell an unlocked iPhone 4S in the US for November, some buyers have found that AT&T might already be selling its version unlocked in certain circumstances. A post by developer Steve Troughton-Smith, a check by 9to5, and reports from the MacRumors forums have shown that the full price, off-contract iPhone 4S should work with any compatible GSM-based carrier, such as T-Mobile. While it's not certain if any special steps need to be taken, restoring the phone produces the same "Congratulations! Your iPhone has been unlocked" messag...
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