Another loophole is to transfer your upgrade to a dumphone (assuming you have a dumbphone on your account), upgrade that line to a GN2, keeping unlimited on your other lines and adding a tiered plan to this line, activate, deactivate and put the flip phone back on which will cancel the tiered data plan again leaving your other lines untouched, move the GN2 to the line of your choice. You may potentially receive a months data on your next bill. Call 611 and explain the situation and you'll be credited back for the month (minus a day) on your next bill.
I've done it twice now. Enjoy!
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Sooner or later Verizon will catch on and fix these loopholes.