You could delete what you typed by tapping the backspace key a few dozen times, or you could select the text with your fingertip and tap “Cut.”
Or, you could try a third, well-hidden option: just shake your iDevice.
When you do (in the Messages, Mail, Calendar, Notes, or Contacts apps, among others), a pop-up will appear with an “Undo Typing” button.
Tap the “Undo” button, and whoosh—the text you just typed will disappear.
Change your mind? Shake again, and tap the “Redo” button.
Looking for more iOS tips? Click here!
Note: This updated tip was originally published in April 2012.