Apple Inc. this week said the iPhone 6S and iPhone 6S Plus SKUs sold 13 million units in first-weekend data from global retail.
By comparison, the iPhone 6 and 6 Plus sold 10 million units in the first weekend of availability.
The product will be sold in an additional 40 countries Oct. 9.
The iPhone 6S and iPhone 6S Plus include a 64-bit A9 CPU with M9, 7000 series aluminum body, 2nd-generation Touch ID, 12MP iSight camera, 4K video functionality, 5MP Facetime HD with Retina Flash and Live Photos functionality.
The iPhone 6 16GB SKU sells at $199, 64GB at $299 and 128GB at $399 with two-year service contract.
The iPhone 6S 16GB SKU sells at $299, 64GB at $399 and 128GB at $499 with two-year service contract.
Pre-order sales, which began Sept. 12, quickly sold out at the Apple online store and network carriers.
Shipment times for new orders now stand at three to four weeks for select SKUs.