Can a iPhone 6 Plus case fit on a iPhone 6S Plus?

Can a iPhone 6 Plus case fit on a iPhone 6S Plus? - 1

Only if the case is a soft one. The 6S Plus is thicker. Not by much, but enough to keep a hardshell from closing.

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Yes most cases of an iPhone 6 Plus will fit a 6S plus. However, like Scott said the 6S is thicker but just a tiny bit not that much. So most 6 Plus cases should fit the 6S plus without a problem