Shake the iPhone, then tap Undo
Tap Undo on the keyboard if it appears
Use three-finger swipe left to undo
In Notes, tap the Undo button if available
In Mail, shake the iPhone or use three-finger swipe left
In Photos, tap Undo after editing
In Safari, use the Back button to undo navigation
In Files or other apps, use the app’s Undo option if available