Can I Upgrade My Blackberry Curve 9300 To IPhone 5? - 1

I've got a blackberry curve 9300, and I want to upgrade my contract to the new IPhone, I've had my blackberry for 15 months, can I do it? I'm on 02.

Honestly, go with Samsung Galaxy Nexus or Samsung Galaxy S III. They are much better phones. There's no difference in the iPhone 5 from the iPhone 4.