If I buy a iphone off Ebay can I just insert my SIM card into it. The reason I'm asking is that I don't want to buy one from AT&T. I'm a AT&T customer, but I have a sweet package from when I was with cingular. They can't change it unless I agree to get a new phone from them. So if I buy it can I just stick my SIM card in it and be good to go?
Thanks
Thanks


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