Upgrading my 3GS to Iphone 5s?

I was going to upgrade my 3GS from AT&T to the 5s but I don't have an upgrade to do so. I'm planning on adding a line to my plan and was wondering if when I were to add a line, if it were to either come with an upgrade or if it were possible to receive the 5s for the price of a new contract price?

Generally when you add a line you get a discount on the phone

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