I am thinking of getting a Samsung Captivate, and using it on T-mobile. I believe the Captivate should be relatively easy to unlock through XDA how-to instructions, but please correct me if I am wrong. Are there any things I should be aware of, check out before I get one? Anythings like firmware updates to be cautious of, OS updates that may make it harder to unlock, etc? Thanks for any insight you can provide.