<P> The iPhone 6S has a similar design to the 6 but updated hardware, including a strengthened chassis and upgraded system - on - chip, a 12 - megapixel camera, improved fingerprint recognition sensor, and LTE Advanced support . The iPhone 6S also introduces a new hardware feature known as "3D Touch", which enables pressure - sensitive touch inputs . </P> <P> iPhone 6S had a mostly positive reception . While performance and camera quality were praised by most reviewers, the addition of 3D Touch was liked by one critic for the potential of entirely new interface interactions, but disliked by another critic for not providing users with an expected intuitive response before actually using the feature . The battery life was criticized, and one reviewer asserted that the phone's camera wasn't significantly better than the rest of the industry . The iPhone 6S set a new first - weekend sales record, selling 13 million models, up from 10 million for the iPhone 6 in the previous year . However, Apple saw its first - ever quarterly year - over-year decline in iPhone sales in the months after the launch, credited to a saturated smartphone market in Apple's biggest countries and a lack of iPhone purchases in developing countries . </P> <P> Before the official unveiling, several aspects of the iPhone 6S were rumored, including the base model having 16 gigabytes of storage, the pressure - sensitive display technology known as 3D Touch, and a new rose gold color option . </P> <P> iPhone 6S and iPhone 6S Plus were officially unveiled on September 9, 2015, during a press event at the Bill Graham Civic Auditorium in San Francisco . Pre-orders began September 12, with the official release on September 25 . </P>

How much did the iphone 6s plus cost when it first came out