The iPhone 6S Plus (stylized as iPhone 6s Plus) is a smartphone designed by Apple Inc. The device is part of the iPhone series and was 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. More: