September 23, 2010 by Rosco 12 Comments iPhone Tips: How to Undo & Redo Quick iPhone Tip. How to Undo/Redo a typing operation on your iPhone similar to CTRL+Z in Windows or CMD+Z on a Mac. Share this:Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)MoreClick to share on Reddit (Opens in new window)Click to share on Tumblr (Opens in new window)