A small green dot that appears at the top of a smartphone screen can signal that the device's camera is active. This feature is available on both Android and iOS devices and usually appears when a video call app is opened or a photo is taken. However, the green dot can also appear if an app or website is using the camera without the user’s knowledge, possibly due to an app misusing its permissions or permissions that were granted too quickly during setup. If users suspect their camera is being accessed without permission, they can identify the responsible app. On Android, swiping down the notification bar and tapping the green dot will show which app is using the camera. On iOS, swiping down from the top right corner of the screen reveals the same information. Once identified, users can check the app’s sensor usage history and revoke camera permissions if the app doesn’t need them. On iPhones, this is done through Settings > Privacy and Security > Camera. On Android devices, the process may vary slightly by model, but it typically involves navigating to Settings > Security and Privacy > Privacy Settings > Permission Manager. It's important to note that iOS uses different colors for activity indicators. A blue dot indicates that the device's location is being used, while an orange dot signals microphone activity. On Android, the green dot covers activity related to the camera, microphone, or location. Additionally, iOS offers an accessibility option that allows users with color vision difficulties to replace the orange dot with an orange square, making it easier to distinguish between different types of activity.