It’s the S year for the iPhone which means all the changes happen on the inside—and there’s a lot of that on the iPhone 6S.

The iPhone 6S (and the 6S Plus) got the expected internal upgrades—a faster processor and more RAM. But there are two significant changes: an improved main camera (from 8 megapixels since the iPhone 4S, to 12 megapixels) and 3D Touch.