First, you have to turn on the function of rotating the screen, and then hold the phone vertically to turn it into a vertical screen. On the main screen interface of the mobile phone, slide from bottom to top, and then click the button of the straight circle center lock sign directly on the control center interface to turn on the lock screen rotation function, so that you can always keep the screen upright. Just want to turn the screen sideways and turn off the lock screen rotation function.