First cracks, now bumps: what's happening to the iPhone Duo's inner screen?

It looks like there’s a new issue with the iPhone Duo that’s taking over the r/iPhoneDuo subreddit. It doesn’t show a cracked screen. It shows a small raised spot on the inner display, right on the crease, at either the top or the bottom of the hinge. Most owners say it showed up suddenly, somewhere between three and ten days after they got the phone.

It’s easy to miss with the screen on. Turn the display off and tilt it toward a light, and it’s obvious. Some owners, like u/Strazit, also say that they can feel the bump when they move their finger over the spot.

Their thread has more than 450 upvotes and 350 comments. The owner said the bump appeared a week after pickup, “it’s easy to feel when you run your finger over it,” and folding “feels fine for the time being.”

Where on the screen is the bump showing up?

After checking out close to 10 threads about the issue, I noticed that the bump is showing up at the top end of the crease, and a smaller group sees it near the bottom of the hinge. One of the earliest posts, from October 26, got around 745 upvotes, with plenty of “me too” replies.

I’m seeing reports coming in from multiple regions, including the US, the UK, Sweden, and the Netherlands. A Dutch owner said theirs appeared “after 5 days of normal use” with no case or screen protector. Both colors and every storage size from 256GB to 1TB show up in the reports. A quick search for “bump” on the r/iPhoneDuo subreddit brings up plenty more. One commenter called a new thread the “5th post like this I’ve come across in the last 24hrs.”

Is this connected to the iPhone Duo screen cracks?

Last week, we covered iPhone Duo inner screens cracking along the hinge, sometimes within hours of unboxing. Apple has since told MacRumors that it knows about the problem:

We are aware of an issue impacting the inner display on a small number of iPhone Duo units. If users experience issues with their iPhone Duo display, they should contact AppleCare for a replacement.

That said, Apple didn’t explain what might be causing the problem or how it aims to fix it. iFixit’s teardown found that the hinge uses curved guide rails and a center support bar meant to drop as the screen folds. In its model, if that bar doesn’t drop far enough, the folded screen lands on it and creates a “stress hotspot.”

Here’s my take, though it’s only speculation. Notice where the hinge parts sit beneath the display, then compare that with where these bumps appear — they’re in the same areas. A bump suggests that something behind the screen may be pushing outward. Strong pressure could crack the panel, while gentler, steady pressure could leave a raised spot. It seems like too much of a coincidence to overlook.

Owners have reached the same conclusion. One said the hinge mechanism “sits exactly where this bump is.” Here’s how one commenter explained it:

The hinge moves in and out with the screen, if a bulge appears, that means the hinge has failed, as it [is] in the ‘out’ position when … it should be ‘in’. What causes the screen to crack is the failed hinge gets stuck ‘out’, and when you close the fold, pressure… causes the break. – u/andercode

Some say the bump came first and the crack followed. One commenter had “the exact same bump after a week,” then the phone stopped closing properly and “ended up cracking.” Another owner said they’d heard “a loud crack” a few days before their bump appeared.

Could it be something harmless?

Some owners think so:

• Screen protector movement: One commenter suggested that the matte (nanotexture) protector shifts at the crease. But that doesn’t seem to be the case since the bump can be felt when users move their finger over the spot. The screen protector, if loose, would simply go flat if you moved your finger over it.
• Dust or debris: iFixit did find fine dust can reach the hinge.
• A bad batch, not a design flaw: One commenter argued a design flaw would have shown up in Apple’s “10k+ folding tests.” Several affected phones have September 2026 batteries, though a battery date only shows the earliest possible build month.

There’s also a twist to this. I spotted a couple of posts where the owners say that the bump randomly went away.

Three others in that thread said their bottom bump vanished overnight, and one owner’s top bump “cleared up” too. Skeptics say it “comes back very soon since it really never left,” or as one put it, “something under there is moving that shouldn’t be.”

Is Apple replacing iPhone Duos with a bump?

It depends on who you ask:

• One owner got a free replacement after a 10-minute in-store check. A UK owner said their store “flat out replaced it under warranty.”
• Another was told no replacement for “an obvious bump under the crease until it has actually done damage to the screen.” That post has about 1,200 upvotes.
• One commenter was quoted a $99 fee on a three-day-old phone.

The most frustrating story is from an owner whose bump appeared on day 10, near the bottom.

Apple called it a manufacturing issue from a photo, then said Express Replacement wasn’t available “due to the volume of requests for repair,” and a replacement could take until January. When they pushed, a rep said the warranty wouldn’t cover it. Others say stores without stock order a unit, which takes three to five business days.

What should you do if your iPhone Duo has a bump?

Based on what’s worked in these threads:

1. Document it right away. Photograph it with the screen off, tilted toward a light, and note any pops or stiffness.
2. Check your return window. Apple’s standard window is 14 days, and several commenters suggest a refund now and a rebuy later.
3. Book a store appointment instead of relying on phone support. The best outcomes came in person. Mention Apple’s statement on the inner display issue.
4. If you’re turned down, write down what you were told. It helps if the bump becomes a crack.

I couldn’t find any Apple support document that mentions a bump. Until Apple says otherwise, I’d treat a new bump on the crease as a warning sign and get it on record while the phone is still under warranty.