Hi friends I am Ashutosh Singh. I I am going to tell about vivo y69.so read carefully please. Background apps button: short press the button to view background activity. Power button: press and hold this button to turn on your phone. When the phone is on, press and hold to power off or perform other operations. Press once to lock the screen except on certain interfaces. Whilst locked you, will still be able to answer incoming phone calls. home button: When an application is running, pressing the key can make the application to run in the background.