i have a contract with fido for 3 years but im not sure if i can change phone? :[?

i have a contract with fido for 3 years...its been 2 years now...and ive been wondering if i can change phones...right now i have a sony ericsson w380..and i want to change to a blackberry curve 8520...can i change phones?...and if i can how much would it cost?(ive never changed phones..ive had that phone for 2 years now)
 
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