Apple's fall 2025 iPhone lineup includes the foldable iPhone Duo and the traditional iPhone 18 Pro series, each targeting different user preferences.
Form factor and dimensions: The iPhone Duo is a foldable device offering an iPhone and iPad experience in one, with a 5.4-inch outer display and 7.6-inch folding display. The iPhone 18 Pro maintains a traditional form factor with 6.3-inch or 6.9-inch Pro Max screen options. The Duo measures 4.64 inches closed and 6.48 inches open, weighing 8.96 ounces (254 grams).
Displays: iPhone Duo features dual displays with a nano-texture finish on its folding screen, a first for iPhone. The iPhone 18 Pro offers standard single-display sizes.
Cameras: iPhone 18 Pro has a clear advantage with a 48MP Main camera featuring variable aperture and a Telephoto camera missing from the Duo. The Duo's Main camera lacks variable aperture, placing it behind the Pro line.
Battery life: Apple quotes up to 44 hours for the Duo's outer display, 31 hours for the folding display, 36 hours for iPhone 18 Pro, and 45 hours for the Pro Max. Average video playback for the Duo falls around 38 hours.
Other features: The Duo uses Touch ID while the 18 Pro uses Face ID. The Duo lacks an Action button but offers Camera Control, Split View multitasking, and upcoming Apple Pencil support. Both models include a C2 modem, though the Pro Max uses Qualcomm.
Source: 9to5Mac · Summarized by HeadlinesBriefing