This problem has been mostly solved. You don&#x27;t need a deep learning algorithm to detect a face. There&#x27;s an entire company that has sprouted from online education by providing solutions for the proctoring of exams (the webcam is turned on, and facial movement that suspiciously turns towards offscreen areas is flagged). I&#x27;m not even sure the phone&#x27;s camera would have to be on to do the mobile app detection you describe.