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The iPhone 6s was released in September 2015 and was sold through September 2016. It features 2GB of RAM with an Apple A9 chip providing 70% increase in CPU performance and 90% increase in graphics performance over the previous generation A8 Chip. The camera also got upgraded to a 12MP rear camera capable of recording video in 4K. This was also the first model to include 3D touch alongside a taptic engine.