So I have 2 eligible lines on my AT&T account, and when I go to Apple.com, I get a message saying they can't upgrade me due to my AT&T wireless being billed with other services, I have DirecTV, and they combined the billing, but I de-combined, but it still is a U-Verse account according to AT&T CSRs, my question is, can I set up a reservation coming up at 8AM on the East coast for a 128GB 6S Plus, and go in and decide to try my AT&T Next plan that I have available?