After a 4 million-unit introductory weekend
Apple has updated its "how to buy" page for the iPhone 4S to note that Apple retail stores in the United States and Canada are now selling the device on a reservation-only basis. Customers will need to visit Apple's site after 9:00 PM each evening to reserve a phone for the following day.
“iPhone 4S is available in store by reservation only. Reserve yours after 9:00 p.m. tonight for pickup tomorrow. When you come in, you’ll choose a carrier and plan, and we’ll get your iPhone up and running before you leave the store.”