DUDE! The first thing it says you need is a sim card!! This is the whole point! I'm a level 3 tech and know my stuff, there are no sim cards on any sprint phones. And as far as i know, there never will be.
And like robotron says, all the carriers use different frequencies, they have to or all our data and calls would get overlapped and corrupted most likely. Now if boost mobile is still around, which it sounds like they are, that's 1 of the only other carriers that i know of, that a sprint phone will work with. Like kg4 says, you'll need to clear your esn, and update your IMEI number accordingly. Ok, I'm done ranting, i won't comment in here anymore.