Recently I noticed I was being charged city and state tax for my previous residence, despite having changed my address in Verizon’s system a while back.
After nearly 3 months of calling and a support ticket created, I finally received the reason for this today:
the ticket came back and shows that you got the phone under edge in il and since you got the phone there the taxes are correct.
So basically the taxes on your phone payments will always be based on where you got your current device.
A corollary to the above is it’s a good idea to buy your next phone in one of the following states that don’t charge sales tax if you’re gonna be there anyway: Oregon, New Hampshire, Montana, or Delaware.