Verizon is now offering 4G. When I bought my Droid X i was really interested in the Sprint phone that had 4G but the salesman talked me out of it by saying, "When 4G becomes available on Verizon you will be able to upgrade." Ok, its here now, but to what can I upgrade? Is there a way to change to software on the DX so it does 4G? Or was all this just hype to get me to buy the phone?