Triple-click Home

Triple-click Home provides an easy way to turn some of the Accessibility features on or off when you press the Home Home button icon button quickly three times. You can set Triple-click Home to turn VoiceOver on or off, turn White on Black on or off, or present the options to:

Triple-click Home is turned off by default.

Set the Triple-click Home function: 

In Settings, choose General > Accessibility > Triple-click Home and choose the function you want.