When the screen is locked, you can use it as a notepad to note down relevant information. You will write on the screen by using your fingers. You have 6 pages which are accessible by scrolling up or down with three fingers. All pages are saved and stored while not erased. In order to blank a page, you will tap on the screen three consecutive times with three fingers. You can also erase the notes by pressing on the "delete" button at the top-left corner of the locked screen.