I don't believe there is such a thing as a grandfathered JOD plan. You either have JUMP! or JOD. The terms can change at any time. There are 3 jumps per 12 months. However, they are making it more expensive to do the 3 jumps per year because they are not honoring the zero down anymore. Which, I am sure, is their end game. Sounds a lot like Verizon, yes?
My point with one of the reps on Twitter was that they could consider "allowing" no down payment on accounts with good standing or honor the terms at which you signed onto JOD. But, they don't.
Once I get onto the Note8, I will be back on the yearly upgrade cycle as I was before the Note7 debacle.
At least that way, they can only get me once a year.