green dot next to camera icon on the iPhone Lock Screen?
Why is there a green dot on the top left of the camera icon on the iPhone Lock Screen?
iPhone
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It's probably the icon that lets you know your camera is being used..
You can test by opening the camera app and closing it. When the camera app is open, that green indicator should be on.
About the orange and green indicators in your iPhone status bar - Apple Support
If this is not what you are talking about, post a screenshot so we can see