indicator light
When Iam speaking on the I phone I notice a little light in the upper right of the near the battery indicator. Why?
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The green indicator tells you that one or more apps have used your camera. For example, you will see the green indicator when you make a FaceTime call.
You can see which app has used your camera at the top of your Control Center.
You can also see and disable your apps that have access to your camera here:
Settings → Privacy & Security → Camera
You can find more useful information here:
About the orange and green indicators in your iPhone status bar - Apple Support