Most people know using a phone in dark, public places like a movie theatre will earn you evil stares from everyone around you. But if you really must, Wired offers this simple trick to make it less annoying.
Photo by Alex Washburn/Wired.
All you have to do is invert the colours on the screen. To do this, look for the Accessibility section in your phone's settings. On the iPhone, set the triple-click setting to "Invert Colours". On Android, select "Inverted Rendering".
Then you'll be able to text or email in the dark without drawing everyone else's attention. You might want to do this at night anyway to save your own eyeballs.