I have an iphone (1st gen) can I keep my plan if I buy an iphone 3g or 3gs and just

ipodthis123

New member
pop in my sim? I have a first generation iphone, if I buy an iphone on ebay 3g or 3gs can I still keep my current unlimited plan and just pop in my sim into the new iphone or do I have to activate it and choose their new plans?? thanks
 
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