said by Ctrl Alt Del:From what I've seen this is not true. A friends wife upgraded to the iPhone 5 taking the discount and giving up unlimited data but they were not forced to take the data share plan. They still let them take the single plans with 2GB limit which is cheaper than the shared plan. He kept his Android smart phone with unlimited data on the same account and was not affected.
Any smartphone on Verizon requires a data share plan.