iPhone data plan question?

spiderman0528

New member
My dad is upgrading to a iphone 3GS and is giving me his old 3G iphone. The problem is, im added on my grandparents plan for an additional 9.99 a month. Will i have to pay the iphone 30 dollars a month data plan price when I put my SIM card in from my old phone into the iphone 3G?
 
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