The iPhone 6S and iPhone 6S Plus (stylized as 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 at the Bill Graham Civic Auditorium in San Francisco by Apple Inc. CEO Tim Cook. The iPhone 6S and iPhone 6S Plus jointly serve as successors to the iPhone 6 and iPhone 6 Plus of 2014.