A small green dot appearing at the top of smartphone screens indicates when an application is actively using the device’s microphone. This feature, often unnoticed by users, is a privacy measure implemented by both Android and iOS operating systems. The indicator aims to provide transparency regarding potential audio recording by apps. Its presence doesn’t necessarily mean an app is maliciously recording, but alerts users to active microphone access. Users can review app permissions in their phone settings to control microphone access. This feature enhances user awareness and control over their device’s privacy settings.