CUPERTINO, Calif. – Orders for the iPhone 5 topped 2 million in their first 24 hours, more than double the amount of its predecessor over the same period.

Since Apple started taking iPhone 5 orders on its website at 2 a.m. on Friday, buyers who have a two-year service agreement with AT&T, Sprint or Verizon Wireless have been able to order the phone for $199, $299 or $399.

Apple said Monday that while most orders will be delivered Friday, demand for the iPhone 5 exceeds the initial supply. As a result, some of the devices are scheduled for delivery in October.