Apple Inc. said Monday that it had more than four million preorders of its new iPhone 6 and iPhone 6 Plus in the first 24 hours, a figure the company dubbed a record.

The demand for the new smartphones exceeded the initial supply, the company added, and "a significant amount" of the phones would be delivered to customers Friday and throughout the rest of September. Many of the preorders will be delivered in October, however, the company added.

Apple also said additional supply will be available to walk-in customers Friday at 8 a.m. local time at its retail stores.

"Customers are encouraged to arrive early or order online from the Apple Online Store to pick up in-store or receive an estimated delivery date," the company said.

The models will be available Friday from T-Mobile, Sprint, Verizon and AT&T, Apple said.

Write to Michael Calia at michael.calia@wsj.com

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