so i got a sidekick 4g from tmbolie. but i want a a blackberry, so like i have the moeny to buy a black berrry, and i heard abt unlocking a phone in where u can use any phone on the company u got, so like will it work? and like i know at&t and verison have blackberrry. can i get any blackberrry and will it work with me having tmoblie.