I am currently with Verizon and I want to upgrade to the Motorola Droid from my current Razr. I checked online and it said I could upgrade to it for $150. However, it said I would need a data plan. If I get the Droid with the $30/month data plan and then I switch back to my old Razr, will I be able to cancel the data plan? And, if i do succeed in cancelling the data plan, will I be able to switch back to the Droid without having to get the data plan again? Thanks 