Change my iphone 4 to iphone 5?

So, i have iphone 4 with 2 year contract. And I want to change it with iphone 5 and keep my plan. Is it possible to do that? Or is there any fees that i have to pay?

That's pretty simple.
http://www.imore.com/...ware-files
This is where you go to iphone files gen you want to download.
This link is directly to the downloads you want! Good luck!
I'm currently, downloading ios 6 because i hate ios 7.

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