One of the features of the new iPhone 3 OS that I discovered quite by accident is the ability to “undo” typing. Just give the phone a quick shake when you’ve typed something you don’t want. The “Undo Typing” dialog will slide onto the screen.
![Undo Typing Undo Typing](http://www.thelaughingdm.com/wordpress/images/Apple/iPhone-Undo-Typing.png)
If you happen to shake the phone when there is nothing to undo then the “Nothing to Undo” dialog will slide onto the screen.
![Nothing to Undo Nothing to Undo](http://www.thelaughingdm.com/wordpress/images/Apple/iPhone-Nothing-To-Undo.png)
This handy feature isn’t available everywhere in the phone. For example, the keypad used for actually dialing telephone numbers does not support undo.