I was told by CSR that the unlimited data feature went with the line of service, not the device on the line, so as long as you are switching between devices that use the same data plan you would be fine. He said that he could not be 100% positive on switching between BB and other smartphones, the BB plan was worded slightly differently, I'd clarify that if you're dong that kind of switch. I'm going to do all switching in a Verizon store to get some kind of print out that shows I still have unlimited before I walk out the door!