I'm strongly considering upgrading to the 4G plan. I already have a new 4G Verizon modem, but I'm afraid it may not work in my particular application. It's not important what that is, that's another topic for discussion. So, my question is: If I can't make the new device work in my application, can I: 1) Reactivate my current device and basically roll back to what I'm doing now? 2) Can I give the new modem to someone and will they be able to reuse/reactivate it on their own account (with their number not mine)?