Like secret settings? Here’s how to make your iPhone screen display using only red light. Great if you’re out camping, stargazing, or just don’t want to lose your night vision. Here’s how:
Settings –> General –> Accessibility –> Display Accommodations –> Colour Filters –> Colour Tint Move Intensity and Hue to the right. Turn off Colour Filters. Go back to Accessibility, then select “Accessibility Shortcut.” Choose the “Colour Filters”. Turn it on/off by triple-clicking the Home button.