How to keep the unlimited data plan on Verizon when switching to the Iphone 5?

My mom & I share a family plan on verizon & I have a smartphone(HTC Thunderbolt), she has a non-smartphone because she only needs calling. I've been eligible for an upgrade for a couple of months now. I have no problem not upgrading to another phone, but recently I dropped my phone and the screen cracked badly. My mom kindly suggested that I get myself the new iphone 5. I was doing some research on the cost and I found out that if I were to upgrade, I wouldn't be able to keep the unlimited data plan I have on my smartphone. I don't use a lot of data, but the most I've used is 11GB. I do want to keep the unlimited data plan to be on the safe side, but it sucks they got rid of it now. I read while googling away, searching for options, and I found that I can give my upgrade to my mom's phone and have her get the Iphone 5 at the discounted price of $199, 99 and get the 2GB data plan. Then when we physically have the phone, call Verizon and have them switch the iphone to my line and cancel the 2 GB data plan. Does anyone know if this is still possible? Or have any suggestions.

The only way to keep unlimited data with Verizon at present time is to buy the new phone at full price. If you want the phone cheaper up front, you will lose the unlimited data plan.

I think your fine using your moms upgrade. It's done quite a bit. I recently double checked with Verizon and they said yes it can be done and not loose your unlimited data… Good luck

You should require verizon's help