Can I get an iPhone 5 for half the price at T-Mobile?

I did my research and I'm more confused. Okay. A little over 3 years ago I got a 2 year contract with T-Mobile and the contract expired last year around June and never got another contract, just left it like that. Now I've heard they no longer have these contract requirements. I've been wanting the iPhone 5, as well as a new plan that allows me to have unlimited everything. My question is, will I be able to get the iPhone for at least half the price if I just go in there and ask to change the plan I'm on? Or does everyone eventually end up paying full price, but with monthly payments. Someone please explain.

Link below: T-Mobile Individual Plans