Not exactly though right?
With Next 18, there are 24 payments, so after you've paid 18 (each month, or prepay after 12 so you can upgrade for the 6s), you can trade in and then upgrade. And you've paid 18/24 or 75% of the price of the phone.
With Next 12, there are 18 payments, so after you've paid 12, you can trade and upgrade. And you've paid 12/18 or 66% of the price of the phone.
If that's the case and you want to trade in after 12 months (with either Next 12 or Next 18, you're paying less if you'd just signed up for Next 12.
Am I right here?
From what the AT&T rep told me, even if I pick the 18 month plan, I can trade in my phone for cost even after 4 months if I please. Hence why I will be using my 2 year upgrade for the 6S since it'll be available by then. Even though I'm doing an 18 month plan, they'll allow me to end it after however many months that will be when the 6S releases.