My green light always on

Hi Pasindu01,

We suggest reviewing the following for more information about that icon: 

A green indicator  means either the camera or the camera and the microphone are being used by an app on your iPhone.

Status icons and symbols on your iPhone - Apple Support

Typically, you can swipe down to bring up Control Center which will show you the app using your camera or microphone: Access Control Center on your iPhone - Apple Support

You can check which apps have access to your camera and microphone using these steps: Control access to hardware features on iPhone - Apple Support

We hope that helps.

Take care.