blackberry bold at&t sim card ?

okay so i found a blackberry bold and i would like to use it but there is no sim card in it so i thought i could put my sim card from my phone to the blackberry but it was too small so what am i supose to do ? do i go to the store to a sim card for the phone ? and do i have to tell them that im using that phone now so they know what to charge or what ?
 
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