So don't "switch" as in drop your old plan, just try Sprint out!
If you really don't need your UDP - sell it!
Maybe get a written (email, chat) confirmation that you are supposed to be able to use your Sprint phone on any US domestic carrier.
Take that to an Apple Care store, and make a fuss.
You are right. We use an automated sales tax solution. Basically anyone who is paying tax is paying it on the shipping and its only if your state requires sales tax on shipping. I did not know that...
#1 most likely means certain ports need opening in the built-in firewall.
It's just a matter of MEIDs getting inserted into the database.
OR, Verizon switching an MVNO over to no longer require that whitelist.
This last is most unlikely since that would mean VZW...