So, say you just typed a lengthy text message on your iPhone (or iPad, or iPod Touch), but you’ve had a change of heart and want to start over.

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 iPhone.

Change your mind? Shake your iPhone again, then tap the "Redo Typing" button.

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 button, and whoosh—the text you just typed will disappear.

Change your mind? Shake again, and tap the “Redo Typing” button.

Note: Annoyed when the “Undo Typing” button (or a “Nothing to Undo” error message) appears when you didn’t mean it to? Bad news: for now, there’s no way to customize or disable the feature in the Settings menu.

Want to drop a note in Apple’s suggestion box about it? You can do so right here.

Looking for more iPhone tips? Click here!