AT&T said the day was the busiest for online sales in the company's history, but didn't say how many units were ordered. All iPhone 4s that could be preordered for delivery on June 24 sold out, the company said. Customers who order now will get devices on June 25 or later. There will also be iPhone 4s available in stores on June 24, AT&T said.
Though I was disappointed that only the black model is available to reserve or pre-order (my current iPhone 3G is white), I'm not too fussy about the color, so black it is. But try though I might, it wasn't able to complete the reservation process until late this afternoon. I even downloaded the new Apple Store app to give that a try (unsuccessfully).
I finally did get through the process, with Apple's website telling me "Your reservation is confirmed", though I still haven't received the confirmation email that the page promised. If you had problems earlier today, I recommend you try again.