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If you put your SIM card from your old phone into your new iphone 3G or 3GS you got from eBay will you be charged any kind of fee for upgrading to a new phone?

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No, however you must keep in mind that AT&T requires a special data package for iPhone to be added on your account. Without this additional package, the iPhone will not function on AT&T's network. It is possible to unlock the iPhone to work on any GSM network, but doing so will void the remainder of the warranty.
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