Following yesterday’s official announcement of the iPhone 5 along with an unspecified pre-order window to begin on Friday, carriers are confirming that pre-orders for the iPhone 5 will begin at 3 a.m. Eastern Time/12:00 midnight Pacific Time on Friday. The time was verified by both Sprint and Verizon, with AT&T likely to follow. All of the carriers and Apple will ship iPhone 5 hardware for deliveries starting on September 21. Apple’s…