The tri-fold Tecno Phantom Ultimate 2 is thinner than the Galaxy Z Fold 6

Foldable phones are having a moment, but alongside the release of new book-style foldables and flip-style phones, some are experimenting with new concepts. We’ve seen a few foldables with two hinges instead of one, but the latest concept unveiled at MWC 2025 could be the most polished yet. In fact, the Tecno Phantom Ultimate 2 is one of the thinnest foldable phones yet.

To be clear, the Phantom Ultimate 2 is just a concept for now. Tecno hasn’t said anything about releasing the phone to the public. But, the concept does at least show that work on foldable phones is progressing pretty nicely. 

So, why would you want a foldable phone with two hinges instead of one? It all comes down to more screen real estate. The Phantom Ultimate 2 concept essentially involves one-third of the display on the front when the phone is completely folded up — and that’s what you’ll use in phone mode. Then, you can unfold the device to get a wide aspect ratio, like the phone on the laptop or tablet you already use. That’s instead of the near-square aspect ratios we’ve seen from most foldables so far. 

The device’s thickness is particularly impressive. In fact, the phone is only 11mm thick when it’s completely folded up. That’s thinner than the 12.1mm Galaxy Z Fold 6, which has two sides instead of three. 

According to Tecno, the device achieves that ultra-thin design thanks to a thin battery cover, which is only 0.25mm thick. The display in phone mode measures 6.48 inches, but when you unfold the phone, you’ll get a huge 10-inch 3K OLED display.

Tecno says that the software has been optimized for the huge display, including the different modes that the device can be used in with the two hinges. You can use the device as a kind of big-screen laptop, with one-third of the display lying flat on the table with a keyboard. You can also use the device for things like dual-screen translation. 

As mentioned, this is still a concept, and we don’t know what kind of processor the phone has or the camera specifications. We also don’t know how big the battery is under that ultra-thin cover. And keep in mind that the device would likely be expensive if it ever were to be released.

Regardless, I hope we see a phone like this available to the public sometime soon — especially for those who want a little more productivity from their phone when they’re on the go.

Mashable’s on the ground at MWC 2025, covering the best tech products that have Barcelona abuzz.