I want to upgrade to a PDA phone since I’m going to college soon…?

BUT the only probably is that my contract (it's a family contract) isn't over yet till next year. This happened cause my family added a new line awhile ago and so now we have to wait another year... >.< I'm sooooooooo sick of my phone cause I have the T-Mobile Rarz (pink) phone for almost 2 years now!!!!! =/ SO, I was wondering is it possible for me to get a new phone without getting charged (much or at all)? And I would prefer to have either a blackberry/G1/or even an iPhone. Oh but I do love LG phone's! ^_^ Anyway for me to get one of LG's PDA phone with T-Mobile as my carrier??? Thanks!!!!!