How do i flash my sprint blackberry curve 8330 to cricket's service?

So i want to get rid of my sprint service. i went on the cricket website and saw their plans. there's a $35, $45, $55, and $60 plan. i want the $45 plan but it said under the label the blackberry smartphone is required for the $60 plan. do i have to go with that plan or can i go with the $45 one i want?
 
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