Tests at various levels show that the iPhone Duo is highly durable overall, but the weak points lie in the hinge and internal screen.

After reaching users from October 23, iPhone Duo has been tested by many technology channels for the scratch resistance of the body and screen, resistance to falling at different heights, and especially the durability of the hinge.

JerryRigEverything, a YouTube account with 10.2 million subscribers, tested Duo's durability through a series of "torture" exercises. First, with scratch resistance, the outer screen can withstand hard objects on the Mohs hardness scale of 8, but the inner screen is scratched at level 2, meaning it can be impacted by objects such as keys or coins.

In the dust and sand test, small particles entered the hinge, causing the machine to not close completely. The magnet's attraction is not enough to correct the situation. As you continue to bend, permanent blue stripes appear on the internal screen, then completely lose touch ability. In addition, when exposed to fire, the external screen has no problem, but the internal screen leaves permanent marks.

Duo continued to pass two PhoneBuff channel tests when opening the device and dropping the internal screen directly onto the surface. The screen is not cracked, the hinge still works. Raised edges and screen protectors can help limit damage.

However, when dropping the machine consecutively onto the hinge from a height of nearly 1.5 m, the device began to fail. After the first time, the hinge becomes stiff and the screen is no longer flat. The second drop caused damage to the internal screen along the fold line, along with a touch error. By the fourth time, most of the left half of the screen stopped working, while the external screen was still usable.

AppleTrack, a YouTube account with 600,000 subscribers, also measured the Duo's durability and compared it with the Galaxy Z Fold 8. In particular, with the bending test, the iPhone Duo with titanium frame kept its shape better than the Galaxy Z Fold 8. However, after 1,000 folds, wrinkles on the Duo screen began to become visible, while the Samsung screen was less visible. Testers also found that it's possible to peel off the nano coating on the Duo's display for a better display, but do not recommend doing so as it may increase the visibility of the fold.

At the beach, both remained active when buried in sand and washed with sea water. The next day, the iPhone Duo crashed. When turning on the device, AppleTrack heard a popping sound and detected a dead spot on the internal screen, suspected to be caused by a grain of sand. The results surprised him, because iPhone Duo has IP68 water and dust resistance standards and has passed many tests better than its competitors. Devices from Samsung do not have this problem.

Bao Lam summary

• Some iPhone Duo have cracked and streaked screens
• Face ID gap on iPhone Duo
• Apple was misjudged when ordering iPhone Duo