Ok so this afternoon I needed to undo something on my I-phone. Didn't know so I look it up. Here it is. I thought it was having me on but alas I shook my phone 3 times and the undo menu popped. You young ones better stop laughing ok!
"Type something in the note or highlight and delete some of the text already in the note. Shake the iPhone three or four times. The "Undo Typing" button appears. Tap the "Undo Typing" button."