Dilemma, please help

Alright, so I signed a 2 year contract on my blackberry curve on October 24, 2009. I didn't know about the HTC Hero coming out, and didn't really discover it until it was too late to trade my blackberry in. I really want the Hero but I'm trying to find a way to get the phone without paying $7.50 a month (around $150) to buy out of my contract.

My dad's contract is expired, and he wants a blackberry. Is there anyway he could take over my contract (or something like that), give him my blackberry, and I get the hero?

Or could he just get the Hero, and we just switch numbers?

Any suggestions/scenarios would be incredibly helpful.