Mom-and-pop shops can accept next-gen credit cards early next year -- and avoid the cost of credit card fraud.
The iPhone numbers in South Korea top the preorders seen for Samsung's Galaxy Note 4 over a similar period, says the Wall Street Journal.
Customers can now order the iPad Air 2 and iPad Mini 3 tablets, which will be released next week.
This likely means that Apple is preparing its back-end technology to handle the preorder payload.
If accurate, that's double the number of iPhone 6 and iPhone 6 Plus units sold during launch weekend in the US and elsewhere.
Apple says it hit a record in the first day of sales. However, it confirms demand outstripped initial preorder supplies, so some customers will receive their new iPhones as late as October.
The Moto 360 smartwatch, which sold out in a matter of hours last week, will also be available again, but in limited quantities.
Advance orders began online at 12 a.m. PT on Friday, but the online Apple Store still wasn't back up two hours later. And some other preorder sites had hiccups, including Sprint and T-Mobile.
Despite online-store outages and other glitches, more customers have preordered Apple's two newest iPhones than ever before, the company says.
Online store apparently prepping for consumer demand for pair of new handsets, which feature larger screens than their predecessor.