Announced: Sept. 9, 2015.
Released: Sept. 25, 2015, in the United States.
Notable Specs: Apple's A9 chip with third-generation 64-bit desktop-class architecture; 7000 series aluminum body, or "the same alloy used in the aerospace industry," according to Apple; same 5.5-inch Retina HD display with 1920 x 1080 resolution as iPhone 6 Plus; pressure sensitive display and new "3D Touch" features; camera support for 4K HD video, with resolution up to 3840 x 2160; support for up to 23 LTE bands.
Notable iPhone 6s Plus facts: Besides the obvious size and weight differences between the iPhone 6s and 6s Plus, the larger phone also had an optical image stabilization (OIS) camera feature not found in the smaller iPhone 6s. The phablet also didn't experience the same screen durability issues as the iPhone 6 Plus. And it was available in rose gold.
Sales: Three days after the iPhone 6s and 6s Plus launch, Apple said it sold more than 13 million new devices. It did not break out sales numbers for the different device models.