I'm still trying to wrap my head around how I am able to stay grandfathered in with my unlimited data. I currently have a Droid X2 with unlimited data. I am looking to get the Razr Maxx HD and keep this.. if I were to buy the Razr Maxx HD on Amazon (or where-ever) and just switch phones, would I be able to do so without renewing my contract and keeping unlimited data? Does it matter if I am going from a 3G to a 4G phone? Thanks for any help or suggestions..