Okay, so I know that with at&t, they use simcards [chips] with their service. and I used to have prepaid through at&t, and i would just take my chip out, and stick it in any phone and it would work. But if i tried to put my chip into a smart phone, say a blackberry or something like that, would the internet and everything still work? or would i have to buy a data plan? and can you even buy a data plan with prepaid?