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It may not be possible depending on how old it is. If it is what we call an "old blue" AT&T device, one that was made before the merger with Cingular, then you probably will not be able to. You can call Customer Service at 1-800-331-0500 and they will be able to advise you for sure if it is possible or not. If it is able to be unlocked then they will be able to help you with that also at that number.

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Q: How do you unlock a sim card on a very old AT and T phone?
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