<P> iPhone 6S and iPhone 6S Plus ( stylized and marketed as iPhone 6s and iPhone 6s Plus ) are smartphones designed , developed and marketed by Apple Inc . They were announced on September 9 , 2015 , at the Bill Graham Civic Auditorium in San Francisco by Apple CEO Tim Cook , with pre-orders beginning September 12 and official release on September 25 , 2015 . The iPhone 6S and 6S Plus were succeeded by the iPhone 7 and iPhone 7 Plus in September 2016 . </P>
when did the iphone 6s plus come out
September 25 , 2015