How do I know if mt iphone is a model 6 or 6S?

How do I know if mt iphone is a model 6 or 6S? - 1

On the back of the phone, near the bottom, the work "iPhone" is present. If it is a 6s, there's a"S" in a square with rounded corners. No "S", then not a 6s.

Check the model in
Settings > General > About

Could then cross reference that through a search.