So you’re typing away on your iPhone – maybe it’s a text message or perhaps you’re creating a document in Pages – and you make a mistake. How do you undo? It’s easy. Just shake your iPhone rigorously. You’ll see a small pop-up prompt appear called Undo Typing. Just tap the blue Undo text and whatever you’ve written will be instantly deleted.
Note that you can keep shaking your iPhone to Undo multiple text edits. Also note that this doesn’t work in all apps. For example it’ll work in WhatsApp and Twitter but not Facebook.