By Michael Calia 

Apple Inc. said Monday that it sold more than four million of its new iPhone 6 models in the first 24 hours, a figure the company dubbed a record, while many customers who preordered the device will have to wait until October to get it.

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.

Apple also said additional supply will be available to walk-in customers 8 a.m. local time Friday 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 also will be available Friday from T-Mobile, Sprint, Verizon and AT&T, Apple said. AT&T had said Friday that its first day of preorders for the new iPhones broke the company's own iPhone sales record.

Wireless carriers are pursuing iPhone users with aggressive promotions. Verizon is offering free iPhone 6 devices to customers who trade in their old iPhone and sign a two-year contract, for instance, while Sprint is cutting the price of its unlimited data plan for iPhone 6 users.

As of Friday, Verizon customers had to wait until the end of October for their preorders, and AT&T customers were told they'd have to wait until November.

Frenzied preorder periods are nothing new for the iPhone. Two years ago, when Apple launched iPhone 5, there were indications that the phone sold out about an hour after preorders started, with estimated shipping dates getting further out from the original street date.

   -- iPhone 6 Preorder Delays: Weeks Stretch Into Months 
 
   -- First Impressions of Apple's iPhone 6 
 
   -- Compare: iPhone 6 vs. Galaxy S5 vs. Fire 

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

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