Originally designed as an accessibility feature for people with colorblindness, the grayscale display is now rising in popularity amongst those who want to be less distracted by their beloved iPhones. Each app is obviously designed with the right colors to get you addicted. Just think about that little red notifications bubble - it's almost impossible to ignore! So, if you'd like to be less addicted, check it out.
You can apply the grayscale filter by visiting Settings > General > Accessibility > Display Accommodations > Color Filters. You can also add a shortcut if you'd like to switch between grayscale and full color. Simply return to the Accessibility settings and click Accessibility Shortcut, then Color Filters. Once you have activated the shortcut you'll be able to flick between settings with three pushes of the home button.