Look for the associated icon: When the green dot first appears, it is often accompanied by a small icon representing a camera or microphone, which can give you an initial indication.
Check notifications: Swipe down on your notification bar to get more details about the app.
Identify the app in question: Tapping the notification will show you exactly which app is using your camera or microphone.
Adjust your settings: If everything seems to be in order (for example, when using a video conferencing app), no need to worry. On the other hand, if you have not consciously authorized this use, it is time to act.
What to do if an app uses your camera or microphone without consent
If an app seems to be accessing your camera or microphone unexpectedly, there are several steps you can take to ensure your safety:
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