Sier det som nevnt over, men iPhone 6s har en fysisk home button. Har selv hatt 6s. Det var ikke før iPhone 7 at de kom med den "uekte" knappen som har haptic feedback

*edit*
sakset fra https://www.lifewire.com/how-is-the-...one-6s-4084494

"The 6S introduced the 3D Touch, which allows the iPhone's screen to recognize how hard you're pressing it and respond in different ways. The 7 has the same screen, but adds 3D Touch functionality to another location—it's in the iPhone 7's Home button, too.

Now, the Home button responds to the strength of your touch. Actually, the new Home button isn't a button at all—it's just a flat panel with 3D Touch features. This makes the button less likely to break, aids in dust- and waterproofing (more on that in a minute), and offers potential new functionality for the button."