Apple said its pre-orders of the iPhone 6 and iPhone 6 Plus reached a "record" high, at four million devices sold in the first 24 hours of sale.
The Cupertino, Calif.-based technology giant said the demand exceeds the initial pre-order supply, with many of the iPhone deliveries scheduled now set for October.
Many, however, will still receive the latest iPhone on September 19 and later, the company said.
Apple chief executive Tim Cook said in prepared remarks:
"iPhone 6 and iPhone 6 Plus are better in every way, and we are thrilled customers love them as much as we do. Pre-orders for iPhone 6 and iPhone 6 Plus set a new record for Apple, and we can’t wait to get our best iPhones yet into the hands of customers starting this Friday."
The older-generation iPhone 5s reached nine million devices sold in the first weekend,. It's not clear if iPhone 6 and iPhone 6 Plus sales exceeded sales when it first launched, however.
The latest version of its mobile operating system iOS 8 will be released for free on September 17. It is available on the iPhone 4S and later, iPad 2 and iPad mini and later, and the fifth-generation iPod touch.