Maintaining unlimited data on vzw iphone 5?

I'm upgrading to a new iphone. Currently I have unlimited data and would like it to remain that way. Currently my line isn't up for upgrade but another person on my family plan is. Is it possible to upgrade through their line for iphone 5 at discounted price and have that number under the iphone 5 initially, then reactivate that lines old iphone 4s, then take the iphone 5 and activate it under my number while keeping my unlimited data.

My data consumption isn't that drastic but vzw has really upset me by basically forcing me get rid of unlimited and go to capped data and I'm just trying to find a loophole and stick it to them!

Added (1). I'm not trying to transfer the upgrade to my line, that would not work. I'm looking to upgrade the other line as if I was going to maintain that. I feel it is similar to as if the other line sold the phone on ebay then I bought it on ebay at "full price", except i'm obviously just selling it to myself without ebay but same concept. I know it will extend the other line 2 years, but my family has been using each others upgrades everytime someone has gotten a new phone.

No, there's no way to do it. They'll notice the switch in phones and change your plan accordingly.

I just called AT&T about this and they said absolutely your can keep your unlimited but the line your going to use to upgrade will be on a new 2 year contract.

Verizon has made it VERY clear that unlimited data is gonzo.

If you upgrade to any new device, you have pick one of their new plans.

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