Before installing the app, make sure to:

Searching for usually refers to a modified version of a discreet photography app designed for Android. While these "unlocked" versions promise premium features for free, they carry significant security risks and legal implications. Overview of Spy Camera OS 3 (SC-OS3)

If you are looking for security or discreet recording, it is recommended to use official apps that focus on transparency and data safety:

Allows users to start recording using volume buttons or specific touch gestures.