Upgrading to iPhone 5 without losing unlimited data?

I currently have the iphone 4 and I want to get the iPhone 5 without losing unlimited data. My contract is up. Is there anyway around this like adding a new line and switching the phone to my current line so I do not lose it. I would appreciate it if you could help.

Sadly the online way you could is if you bought that iPhone 5 at full price

Att yes
verizon no

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