Why are even Apple making foldable phones? Because of Deng! During my years as a professional lecturer, my favorite phone was the Dopod D900. It ran Windows, perfectly compatible with Office software, and when unfolded, it was a mini-computer; when flipped over, it was a regular phone. Back then, phones weren't allowed on airplanes, so every time after takeoff I'd openly unfold my phone, and the flight attendants would ask, "Is that your phone?" I call it a mini computer; I typed many of my course materials, articles, notes, and inspirations on this phone on airplanes—the keyboard feels amazing; Actually, its screen is only 3.6 inches (640×480 pixels), just a tiny bit larger than the original iPhone (3.5 inches); Now my iPhone is 6.9 inches, and my Samsung S25 is a 6.9-inch (diagonally angled), but I no longer use my phone to write anything because my eyesight is failing; Many people don't understand why manufacturers are releasing foldable large-screen phones, because the CEOs of these big companies are about my age, and their eyesight is failing too; Young people, you may not understand why they're releasing foldable large-screen phones, even tri-fold ones, but remember, one day you'll need a foldable large-screen phone too.