Got A1778 today. Ordered from Apple.com at 3:30am on 9/9. Wanted to buy A1660 and enrolled in Upgrade Program as a new member to get 0% loan. Tried various ways but site would not let me specify Verizon model since I have AT&T account. Ordered AT&T reluctantly. Picked up in Apple Store on launch day, received A1778. Asked if I could switch for A1660 but told (no surprise) they did not have any extra inventory and may not for several weeks. I will Activate tonight after unpairing my Apple Watch and iTunes backup of my old iPhone etc. Also opened a new Verizon account yesterday (BYOD using an MEID from an old Verizon phone no longer used.) Ordered additional new iPhone 7 via another enroll in the Apple Upgrade Program, this time choosing Verizon (A1660), ships 9/29. I will cancel the Verizon account within the 14 day window. Plan to return A1778 back to Apple Store within 14 day window and I will tell them the reason is because it's inferior and they should have let me order what I want in the first place. It will remain to be seen how difficult Activation will be of the A1660 using my AT&T SIM.