In this video, we learn how to delete an SMS or email message on an iPhone. Not only is this quick and easy, it can be done for multiple messages that you don't want to keep in your inbox. First, turn your iPhone on and go to your inbox (email or SMS). Next, slide your finger left to right on the message you don't want to keep and then click on the red "delete" button. This will then delete your message! Click anywhere other than the red delete button and this will cancel out the deletion of the message.