I was born in 96 and had a flip phone, I remember getting the Simpsons meltdown on it from the back of a magazine. I'm not a millennial, I'm just about gen z.
Did the same for the secondary screen on my Motorola Razr, which it's only purpose was to display the Motorola logo and IIRC display the camera for taking selfies (since phones didn't have dedicated selfie cams yet). That was all it did.