iPhone - Triple-click Home

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You can also set Triple-click Home to present the option to turn VoiceOver, White on Black, or
Zoom on or off. Triple-click Home is turned off by default.
Set the Triple-click Home function: Go to Settings > General > Accessibility > Triple-click Home.


Many iPhone apps let you zoom in or out on specific elements. For example, you can double-tap
or use the pinch gesture to expand webpage columns in Safari.

Zoom is also a special accessibility feature that lets you magnify the entire screen of any app
you’re using, to help you see what’s on the display.