iPhone Duo Passes 451,000 Folds in CNET Durability Test

Apple's first foldable smartphone, the Apple iPhone Fold (also known as the iPhone Duo), has surpassed 451,000 continuous folds in an ongoing laboratory durability test conducted by CNET. After nearly three weeks of nonstop mechanical operation, the handset's hinge has begun to show noticeable looseness, though the flexible inner display remains completely free of cracks or dead pixels.

Hinge Wear After 440,300 Cycles

According to CNET's testing logs, the iPhone Duo operated inside a custom-built folding rig called the Fold-a-Phone, which opens and closes the phone around the clock. Sensor monitoring showed initial subtle changes in opening resistance around the 390,000-fold mark. Once the counter passed 440,300 cycles, the hinge lost some of its factory tension and stopped snapping completely flat on the automated machine.

At this stage, the machine opens the phone roughly 90 to 95 percent of the way, leaving a slight angle of five to ten degrees at the center fold. Testers noted that the device can still be pressed completely flat by hand and continues to hold intermediate viewing angles without slipping.

Inner Display Remains Intact

Despite the mechanical loosening after more than 451,000 cycles, the flexible OLED panel has suffered no structural damage. The screen shows no deep crease deterioration, blackouts, touch response failures, or sensor glitches. CNET defines complete test failure as a screen blackout, power loss, or sensor malfunction, meaning the experiment remains active as the rig pushes toward higher fold counts.

Real World Context for Foldable Buyers

To put 451,000 mechanical cycles into perspective, folding and unfolding a phone 100 times every single day equals more than 12 years of daily usage. While controlled indoor lab machines eliminate everyday hazards like pocket lint, dust particles, moisture, and accidental drops, the result demonstrates strong mechanical endurance for Apple's multi-component titanium hinge architecture. Prospective buyers considering the $2,000 foldable can check the full Apple iPhone Fold specifications to see how its hardware stacks up alongside clearer evidence that normal daily opening cycles are unlikely to wear out the display panel prematurely.