I just got off the phone with a Verizon Sales rep and she said the trade in can be toward any iPhone 6 or iPhone 6 plus. After asking her multiple times, we both logically came to the conclusion that you are unable to do the pre-order and trade-in promotion online. The Verizon site states in the promotion details that the trade in occurs when you trade in and purchase a new iphone 6 or 6 plus. I basically helped guide the rep to the logical conclusion that if you have to trade it in and buy a new iphone 6 or 6 plus at the same time to get the promotion, there is no way for a Verizon preorder site to know you are doing both UNLESS they have an option in the pre-order screen where you can purchase the phone and request a trade-in box. That way, they would charge your account the full amount and then credit you for your old iphone when they receive and review your phone. But that could be confusing and I doubt they are going to do that. it She then gave me a definitive "no, you can't do that" once I lead her to the conclusion. So again, they don't really know and are not very helpful. I'm going to try one more rep to see if they can give any more definitive answers.