Correct me if I'm wrong, but my understanding is that with an unlocked phone the main advantage is you can take it to any carrier. However I'm also under the impression that with CDMA even if you're unlocked you're still tied to either VZW or Sprint and don't have a choice of one or the other. Is this true? If I buy an unlocked Sprint phone can I put it on VZW? If I unlock my DInc when my contract expires can I take it to Sprint?