Launch week for Apple’s first foldable has turned into a durability marathon on YouTube, and PhoneBuff is the latest to take a turn. After TechRax dropped the iPhone Duo down a 200-foot spiral staircase and JerryRigEverything‘s durability test showed dirt can wreck the hinge, the longtime drop tester put Apple’s $2,999 phone through its paces on Saturday.
What sets PhoneBuff apart is the robotic drop machine the channel has used for years. It lets the phones fall side by side from the same height at the same angle, so the comparison is repeatable rather than a toss of the hand. If you just picked one up, you may want to check out this iPhone Duo case on Amazon before reading on.
The Duo went up against the iPhone 18 Pro Max for the channel’s three standard drops. PhoneBuff pointed out that the Duo is Apple’s most expensive and heaviest iPhone ever, with twice as many screens that can crack and a hinge holding it all together.
First came a one-metre drop straight onto the back. Rear glass cracked on both phones, but the damage spread much further on the Duo since its entire back is glass. On the iPhone 18 Pro Max, the crack stayed contained to the glass section while the aluminum around it only picked up a few scuffs.
Corner drops went the Duo’s way. Both phones kept working with mostly cosmetic damage, yet the iPhone 18 Pro Max’s aluminum frame lost some paint and picked up a dent. PhoneBuff said it saw the exact same thing happen with last year’s iPhone 17 Pro Max, so it doesn’t think this is a one-off. By comparison, the Duo’s titanium frame looked pretty good, with scuffs that are hard to notice in normal lighting.
The one-metre face drop flipped the script. Outer glass on the iPhone Duo cracked, while the iPhone 18 Pro Max’s display survived without a crack. PhoneBuff offered a few possible reasons, such as the Duo being heavier, the 18 spreading the impact across a larger surface, or its aluminum frame flexing more than the Duo’s titanium to absorb some of the hit. The channel was quick to note this is a sample size of one.
Next up were drops built just for the Duo. With the phone unfolded, a corner drop left the inner display intact, and the hinge didn’t even fold on impact. PhoneBuff said its 15-point inspection after the drop found nothing affected, and the titanium corner that took the hit held up well.
Dropping the open phone straight onto its inner display was the moment everyone was waiting for, and the Duo came away looking perfectly fine with no cracks or shattering. A slightly raised lip around the display helps keep the screen from touching the ground, and the pre-applied nano-texture screen protector adds another layer. Even so, PhoneBuff warned that a sharper or uneven surface could have produced a very different result, so the inner screen is not invincible.
That raised lip only goes so far on a rough sidewalk, which is why plenty of new owners will want to grab a rugged iPhone Duo case for everyday bumps and drops.
Things fell apart once PhoneBuff started dropping the closed phone onto its hinge from just under 1.5 metres, again and again. After the first hinge drop, the outside looked fine, but the Duo had noticeably more resistance when unfolding, especially near the end of its range. Once open, it no longer sat perfectly flat, pointing to some internal damage, even though the phone still read the hinge angle correctly.
A second hinge drop left a big streak on the inner display running right along the fold. The screen still worked, but it caused occasional ghost touches where the display would stop responding for a second until the phone was folded and unfolded again. Interestingly, the inner display never touched the ground, since the phone was closed when it landed, so the force travelled through the body to reach the panel.
Very little changed after the third drop. The fourth was another story, causing catastrophic damage where the entire left side of the inner panel failed and the right side showed an image but no longer responded to touch. Only the outer display kept working normally, so the phone was technically still usable when PhoneBuff called the test.
Overall, PhoneBuff said this wasn’t the worst result for the Duo. It held up well through the first three rounds and even survived a direct drop onto its inner display, but the hinge drops are where it started to struggle. The channel added that it has put phones through some pretty extreme drops before without seeing this exact type of failure, though a fresh unit could behave differently.
Its advice for clumsy owners was to get some protection around this phone, which lines up with what we’ve seen all week, from the iPhone Duo hinge fold test to an iPhone Duo teardown showing replacing the inner folding display costs $1,499 without AppleCare+. You can watch the full test above, and if you’re still hunting for one, here’s our guide to iPhone Duo pricing and availability.
Given what a repair can cost, it’s worth taking a moment to see the iPhone Duo case deal on Amazon before your new foldable meets the floor.
After seeing the hinge drops, would you put a case on your iPhone Duo, or are you brave enough to go caseless?
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