What plan are you on? I was on a Nationwide plan with unlimited data for $49.99.
I was able to use the UPGRADE code to get the device for $8 or $0.33 per month.
I paid off the $8.00 device payment and I am on a month to month contract.
However, I am not eligible for an upgrade discount till 12/27/17.
How long did it take for you to be upgrade eligible again and did you have to activate the phone?
I am on nationwide as well with a mix of unlimited and tiered data, though the available upgrade was from a tiered data line
It should reset after you payoff the device almost instantaneously. If it doesn't reset within a day or two, you will have to call Verizon to reset. Generally speaking, I wouldn't pay it off until it has shipped