Why doesn't my iPhone 6s doesn't have night shift?

When I go into settings and then into brightness there's no option for it! My phone is completely updated

Added (1). The title was worded badly on my part but you know what I mean

I understand what you're saying. There should be Night Shift right there in Display & Brightness. Can you post a screenshot of the Display & Brightness? Sure you've iOS 9.3? Go to Settings > General > About and see what version is your iOS coz Night Shift only works on iOS 9.3 and above.

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