I'm 18 and have only ever had a criket cell phone, which is the only plan my dad will pay for me. But I figure since I have a job and am graduating it's about time I paid for my own phone. I really want to get a sidekick, and t-mobile's no contract plans seem really good. The sidekicks are so much cheaper when you buy them off ebay and stuff though, will they still activate a used phone for me if I have never been with t-mobile before? The whole thing seems too good to be true 
What's the catch?
What's the catch?