You should be able to use the discount, I don't know why they wouldn't let you. Well I guess I do, but I still don't see any limit on the credit stating that it can't be used for any future iPhones. Keep trying.
I just got back from buying the 16 gig in white and I used that coupon. You must have the printed out upc code. Also if they say you cant use it buy a $100 gift card then use the gift card. There is always a way around it.
Thanks! That clears it up for me! The Apple Store is 3 times as far as the closest AT&T Store so I will go to the Apple Store to use my credit. Looks like I will have to wait for awhile as all the Stores are out of stock. I will call everyday now to see when more come in. I hate to stand in line, so I will just have to wait. I lost my V1 in May & im lost without my iPhone! Im going for the WHITE 16G!