Within hours after going on sale, the initial shipment of the new iPhones sold out.
Shipping estimates slipped to as far as 4-5 weeks.
According to The Loop, Apple was taken aback by the huge number of customers pre-ordering the device.
“Pre-orders for iPhone 5 have been incredible,” Apple spokeswoman Natalie Kerris told the site. “We’ve been completely blown away by the customer response.”
The iPhone 5 will launch in stores on September 21.