Unfortunately nick is right, VZW "cripples" certain features on their phones, and even having MPT isn't going to help. May want to try searching on Google to see if there is something else out there that will do it.
Just remember, if you get into using other types of s/w with your phone, you could brick it, and really screw things up. So if you do decide to try something else, please do all your homework first.
