The iPhone Duo and iPhone 18 Pro Max approach a large phone differently. One opens into a wider workspace; the other keeps a conventional single-screen shape and a more versatile rear camera system. With Duo arriving in US stores on October 23, 2026, the choice is about what you will do with the extra space.
Discover how foldable phones use flexible OLED screens, precision hinges, and bendable circuits to keep their electronics working through repeated folds.