Samsung mobile phone saves electricity, and introduces five methods respectively: switching sleep mode, turning on power saving mode, adjusting screen brightness, turning off system tools and synchronization function, and turning off background applications. Take Samsung S8 mobile phone as an example. First, switch the sleep mode. 1. When you are not using the phone, tap the power button. Second, turn on the power saving mode. 1. Under the main menu bar, drop down the setting shortcut page of the main page and select "Power Saving Mode". Third, adjust the screen brightness. 1. Under the main menu bar, drop down the settings shortcut page of the main page and select "Adjust screen brightness bar". Fourth, turn off system tools and synchronization functions. 1. Under the main menu bar, drop down the shortcut page of the main page and turn off the WIFI, Bluetooth, GPS, NFC and synchronization options. Fifth, close the background application. Steps to close the background application: Click the menu key in turn under the main menu bar-enter the background program options menu-click "Close All". 1. Under the main menu bar, click and select "Menu Key". 2. Enter the background program options menu and click "Close All".