Using non-iphone att sim in iphone


macrumors newbie
Original poster
Dec 1, 2009
My wife has a work phone through AT&T that has unlimited data, but she hates her phone. I am thinking about getting her a used iPhone for Christmas. Can I just pop her sim card in? Do I have to jailbreak the iphone? Can I do this with the original iPhone or do I need to obtain a 3G or 3GS?

Thank you for your help.
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