.....on several forums (including here). Verizon will allow folks to keep unlimited data by buying their device at full retail price. If you already have unlimited data, you won't lose it unless you buy the phone at a subsidized price (w/ a new 2 year contract). There is not now, nor has there ever been a "4G data plan". I had the Unlimited data @ $30 with my Droid X and when I upgraded to the Motorola Razr, I kept the same exact feature.

There are no other loopholes.