the point is, that I don't want a 'refund', rather just a 'rest' of my IUP. I was just curious if we can just tell apple 'hey, don't refund me, since you pulled my credit history and approved credit to me, I'm just gonna use it to my new iphone'. there we can pre-enroll IUP now.
There's no such thing as a "rest", lol! You just made that up.
You are in the AiUP as long as you make the monthly payment. If you return, the loan is canceled and the sales tax you paid refunded. Once you have finished all 24 payments, you also are no longer in the AiUP.