The iPhone 6S and iPhone 6S Plus are smartphones designed by Apple Inc. The devices are part of the iPhone series and were announced on September 9, 2015. The iPhone 6S and iPhone 6S Plus jointly serve as successors to the iPhone 6 and iPhone 6 Plus of 2014, and predecceesors to the iPhone 7/7 Plus of 2016.
The iPhone 6S is an evolution over its predecessor, featuring improved hardware specifications, including 3D Touch, a force-sensitive touchscreen; upgraded rear-facing and front-facing cameras; a faster Apple A9 processor; a new chassis made of a stronger alloy of aluminum; second-generation Touch ID; improved LTE and Wi-Fi connectivity; and a new rose gold finish in addition to the space gray, silver, and gold finishes found on the previous models, while maintaining an identical design. The devices shipped with iOS 9 pre-installed at launch. The device came in 4 colors--silver, gold, space grey and rose gold.
As of September 28, 2015, 13 million iPhone 6S and 6S Plus models have been sold, setting a new first-weekend sales record, up from the 10 million that iPhone 6 and iPhone 6 Plus units had sold the previous year. It was discontinued on September 12, 2018 when Apple released the iPhone XR, iPhone XS, and iPhone XS Max.