Apple says it had more than four million pre-orders of its new iPhone 6 and iPhone 6 Plus in 24 hours, exceeding its initial pre-order supply.
The company says the phones will be delivered to customers starting on Friday and throughout September, but many won't be delivered until October.
Phones will be available on a walk-in basis from Friday at Apple retail stores.
Both phones will also be available from Friday from AT&T, Sprint, T-Mobile, Verizon Wireless and other carriers and other authorised Apple resellers.
The new phones were announced last week and have larger screens, faster performance, and come equipped with Apple Pay, a contactless payment service.
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They start at $US199 ($A215) at most wireless providers with a two-year contact.
