It’s a rule of all electronic devices that record sound or audio that, when such features are actively in use, a user must be notified as such. It’s the same thing as the big red light that turns on when a video camera is recording. In the case of a Samsung Galaxy phone, your notification that sound or audio is being observed or recorded is the “green dot.”
Whenever an app on your Galaxy phone is actively utilizing either your camera or microphone, the green dot will appear in the top-right of your display, distinct from the rest of your notification bar. When the dot first appears, it’ll show a camera symbol for the camera, and/or a microphone symbol for the microphone.
After a moment, the dot will collapse into a smaller dot, but it’ll remain displayed as long as the phone’s hardware is in use. If you’re not sure which apps are using these features, you can tap on the green dot in the notifications bar to see who the proverbial shutterbug is.
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