To summarize the iPhone Duo: 1. The only fatal flaw is the lack of Face ID, which is the main reason I can't continue using it. Unlocking takes a while, and when using the internal screen, it's often difficult to find the Touch ID button. 2. The weight is manageable, since you hold it in your hand when it's unfolded, effectively halving the weight of each hand. 3. App incompatibility is a minor issue; in the AI era, adaptation is much faster than before. Many apps are only superficially adapted, meaning they only remove the black borders without truly utilizing the large screen. Whether future policies will address this depends mainly on sales. 4. Regarding quality, the screen hasn't cracked yet, but the crease is more noticeable after a day of use, though it's still acceptable. 5. For people who might pick up and put down their phones dozens of times a day, it might be inconvenient. Duo: Take it out - unfold - unlock. Regular iPhone: Take it out - Face ID unlocks seamlessly. 6. My advice: Definitely not suitable as your primary phone. If you're hesitant about buying it, don't buy it. iPhoneaie yyds