As you aren't specifying a model, it's tough to give you any advice because the difficulty of unlocking and the prices vary depending on model. Once unlocked, you can use any phone with any carrier by inserting that carrier's sim card.
Not all phones can be unlocked (obscure Android models that the scene/community haven't released anything for or unlock codes are unavailable for, the newer iPhones and all upcoming iOS 6 phones that won't have unlocks available for some time, etc.).
Why could you use a newer phone right now? Why not get rid of the Blackberry outright?
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