So I wanna get an iPhone 4 and currently have an htc eve shift and I hate! It always freezez and when I need it most it doesn't work. So my contract ends in the beginning of 2013. The iPhone 4 with a 2 year agreement is 100$ and without is 550$. But since I'm already on a 2 year contract can I sign a new one and get the iPhone for $100 or do I have to get it for $550? Thanks