I work for T-Mobile, but am currently with Cincinnati Bell Wireless for my cell phone plan. I'll be switching to T-Mobile very shortly, but I'm not a big fan of most of our phones, and don't want to pay $250 for the Samsung E715. What I was thinking of doing was just buying another phone from Best Buy or another store like it, and swapping the SIM chip in my T-Mobile phone to the one I bought from Best Buy or whatever. Would this work, or would I have to have the purchased phone "unlocked" or whatever? Any information you all have for me would be greatly appreciated. Thanks!