Samsung's Z TriFold: the phone that folds twice
At its thinnest point, the Samsung Galaxy Z TriFold measured 3.9 millimetres — thinner than a stack of four credit cards. Folded into its cover-screen configuration, it looked like any other 6.5-inch smartphone; unfold it once, and a second panel swung out into a 7.6-inch inner display. Unfold it again, and the thing became a 10-inch tablet in your hands, divided by two parallel creases in flexible OLED. It was, by the physics of it, a letter you were holding.
Samsung announced the Z TriFold on December 1, 2025, launched it in South Korea on December 12, and brought it to the United States on January 30, 2026, at a price of $2,899 — the highest Samsung had ever charged for a Galaxy phone, and roughly twice what a flagship iPhone cost that season. It sold out the first day. The internals justified the price sheet if not the retail arithmetic: a Snapdragon 8 Elite processor, 16 GB of RAM, a 200-megapixel main camera, and a 5,600 mAh battery distributed across three cells inside the folding chassis — the largest ever fitted to a Samsung foldable.
The engineering problem at the centre of it was the second hinge. The Galaxy Z Fold series, running since 2019, had established what one hinge demanded: a single plane of rotation, one load on one flexible OLED layer, tolerances measured in microns but constrained to one axis. Two hinges on a single display panel meant two different bending planes, two distinct stress gradients, and a polymer film obliged to survive both simultaneously without delaminating or developing the craze pattern that had killed the original Galaxy Fold’s review units back in 2019. Samsung’s solution was the Armor FlexHinge — now duplicated, with a dual-rail structure that synchronized the two panels through each fold. The 3.9-millimetre figure was the engineering team’s evidence that the solution held.
Huawei had arrived first. The Mate XT was announced on September 10, 2024 — the day after Apple introduced the iPhone 16, a scheduling collision that looked deliberate from at least one side — and went on sale globally in March 2025 at around $2,810. By the time Samsung’s TriFold cleared US shelves, Huawei had already demonstrated that a two-hinge phone was not theoretical. Samsung’s contribution was a different hinge architecture and a distribution footprint that reached markets where Huawei’s supply chain could not.
Samsung discontinued the Z TriFold in South Korea and the United States within three months of its launch. It had been, according to Samsung CEO TM Roh, designed to solve “one of the mobile industry’s longest-standing challenges — delivering the perfect balance between portability, premium performance, and productivity all in one device.” What it mostly proved was that two hinges were an engineering-solved problem. The product itself was a statement device, priced as one; the successor was reportedly in development before the first units shipped.
The question of what a phone is has reopened every decade or so since 1983. In 2026 the answer was still unresolved — but it had, at minimum, one more fold.
Sources
- Introducing Galaxy Z TriFold — Samsung Newsroom — announcement date, TM Roh quote, display and hinge engineering details.
- Samsung Galaxy Z TriFold — Wikipedia — launch dates in Korea and the US, price, full specs including battery and camera, discontinuation timeline.
- Huawei releases world’s first triple-fold smartphone — TechNode — Huawei Mate XT announcement, September 10, 2024, as the world’s first tri-fold phone.
- Huawei Mate XT launches globally — Designboom — global pre-order launch February 2025 and sale March 2025, pricing around $2,810.