How to activate Dark Mode in iOS 11

iOS 11's new "Smart Invert Colors" feature is a dark mode, but smarter. Here's how to turn it on.
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iOS 11 Dark Mode: Enable Smart Invert Feature On iPhone, Here's How

How to Always Use Dark Mode or Light Mode for Any App on Your iPhone « iOS & iPhone :: Gadget Hacks

How to Enable Hidden Dark Mode In iOS 11

How to Unlock Apple's 'Dark Mode' in iOS 11, 12 & 13 for iPhone « iOS & iPhone :: Gadget Hacks

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How to Unlock Apple's 'Dark Mode' in iOS 11, 12 & 13 for iPhone « iOS & iPhone :: Gadget Hacks

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Request] [Tweak] Enable Smart Invert Colors Only on LockScreen - Creates Perfect Dark Mode in iOS 11 : r/jailbreak

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How To Turn On and Off Dark Mode For iPhone 11 Pro Max, iPhone 11 Pro, iPhone 11