My first phone with a camera was a Sanyo SCP-8100 and it also had one of those. The "gee whiz" feature was that you could open the camera app, close the phone,

My first phone with a camera was a Sanyo SCP-8100 and it also had one of those. The "gee whiz" feature was that you could open the camera app, close the phone, and then it would show a live display from the camera on the tiny screen, allowing you to take "selfies" despite only having the single camera.