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Hi guys

I have a quick question. I have iphone 3gs currently. My wife wants to switch to iphone family and she doesn't care what phone she gets. I am hoping to get her the iphone 4s and trade my 3gs with her so that we both have iphones and I will have the new iphone (at the same time I don't have to lose my unlimited data plan). Now the question can I buy here the new phone and is it as simple as changing the sim card since we both are using AT&T

Thanks