Verizon Alternate Upgrade (Transfer iPhone 5 to another line after upgrade)?

Alright, I'm in a family plan, 2 smartphone lines and 1 basic line. I have an upgrade (smartphone line), and my sister (with the other smartphone line) has an upgrade. I don't want to use my upgrade because I have unlimited data. My sister on the other hand does not. If I went down to the VZW store, would they be able to do an "alternate upgrade"? Activate the iPhone 5 on my sisters line, and then deactivate, activate her old phone back on her line, and activate the iPhone 5 on mine within 24 hours? So in the end I keep my unlimited data with the i5.

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