What is the green light on my iphone?

The green light on your iPhone usually indicates an incoming phone call or a FaceTime call. When you receive a call, the green light will flash or remain on to alert you. You can answer the call by sliding the green button on your screen or decline the call by pressing the red button. If the green light remains on without any incoming calls, it could indicate a notification from a messaging app or another app that requires your attention. You can check your notifications by swiping down from the top of your screen to access the Notification Center.