Ringtones for Phones

ok so I have a prepaid phone with at&t on pick your plan. I was wondering if I buy the tilt at full price, then take the sim card out of my prepaid phone and put it in the tilt, if it would work?

then I came to the assumtion, because it is a smartphone, if i would have to buy a smartphone package, i dont even think there is a smartphone package with prepaid phones? :S

I really want this phone will the sim card work if i put it in any at&t phone?

Do I HAVE to buy a smartphone package?

http://www.wireless.att.com/cell-phone-service/cell-phone-details/?device=AT%26T+Tilt+(Refurb)&q_sku=sku1190046