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Apple Unveils Foldable iPhone Duo as Thinnest Model Yet

September 17, 2026 Juli Clover

How the Foldable Design Enables Extreme Thinness

Apple has introduced the i Phone Duo, claiming it as the thinnest i Phone ever produced when measured in its unfolded state. The device achieves a thickness of 5.2 millimeters, surpassing the i Phone Air's 5.6-millimeter profile by 0.4 millimeters. This measurement was confirmed by Apple during the product's announcement, positioning the Duo as a new benchmark in slimness for the company's lineup. While earlier rumors had speculated the device could reach as low as 4.5 millimeters when unfolded—matching the rumored thinness of Samsung's Galaxy Z Fold8—the final design settled at 5.2 millimeters. Despite falling short of the most aggressive predictions, the i Phone Duo still represents a notable advancement in Apple's pursuit of ultra-thin foldable technology.

The i Phone Duo achieves its slim profile through a combination of advanced materials and a reengineered hinge system that allows the device to fold without adding significant bulk. Apple utilized ultra-thin glass and redesigned internal components to minimize thickness while maintaining structural integrity. The foldable form factor enables the phone to occupy less space when closed, but it is the unfolded measurement that Apple highlights as its thinnest achievement. Engineers focused on reducing the gap between layers when the device is open, contributing to the 5.2-millimeter result. This approach marks a departure from previous i Phone designs, prioritizing thinness in the expanded state over other form factors.

What Trade-Offs Came With Pursuing Maximum Thinness

While the i Phone Duo sets a new record for thinness when unfolded, Apple acknowledged that achieving this measurement required compromises in other areas. The device does not maintain its 5.2-millimeter thickness when folded, as the hinge and dual-screen structure add bulk in the closed position. Additionally, rumors of a 4.5-millimeter unfolded thickness were not realized, suggesting challenges in pushing the limits of current foldable technology. Apple did not disclose battery capacity or durability specifications related to the thin design, leaving questions about real-world usability. The company emphasized that the 5.2-millimeter figure applies strictly to the unfolded configuration, clarifying the context behind its thinnest i Phone everclaim.

Is the i Phone Duo thinner than the i Phone Air when folded? No, the i Phone Duo is only thinner than the i Phone Air when unfolded; its folded thickness is greater due to the hinge and dual-screen mechanism.

Frequently Asked Questions

Why didn’t the i Phone Duo reach the rumored 4.5-millimeter thickness? Apple did not achieve the 4.5-millimeter unfolded thickness likely due to technical constraints in materials, hinge design, or component layout that prevented further thinning without sacrificing function or durability.

Does the thinnest measurement apply to both open and closed states? No, Apple specifies that the 5.2-millimeter thickness and thinnest i Phone everclaim apply only when the device is unfolded.

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