sprint cell phone has sim card gsm/cdma?

i need a replacement phone until my contract expires in may because my bb is giving me too many problems...i don't know which phone to get that would be compatible w/ the whole sprint ordeal...(also would i be able to just put the sim card in the new phone or would i have to activate it via sprint...do they even activate phones other then their own?!)
any help will be appreciated

i was thinking of a unlocked jailbroken phone....i want the iphone 4 but that prob not possible maybe the droid x?!

please help :)
alright so it has to be a sprint phone so...which one is the best for sprint... but i don't have to pay additional fees besides my plan like paying for 4g cov?! wtf i already pay more than enough for my plan....thanks
 
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