Jon Prosser’s Ultra Leak Shows Why a Foldable iPhone Changes Everything

Jon Prosser’s latest Front Page Tech (FPT) lays out the most complete picture yet of what he calls the iPhone Ultra. He presents it as a book-style foldable that arrives this September alongside the iPhone 18 Pro and Pro Max, and positions it as the clear premium model of the year. Base iPhone 18 and Air models wait until later, with two color options being offered at launch: black / grey, and white / silver.

Closed, this phone feels completely familiar, somewhat wider than previous iPhones but still fits easily into your pocket, measuring approximately 9 to 9.5 millimeters thick. When you open it up, it’s only 4.5 mm thick, which is significantly thinner than the existing iPhone Air. Prosser claims that the difference will be noticeable the first moment someone picks up both handsets, owing to the titanium build and painstaking engineering that has gone into making the open phone feel as strong as a rock. Many users may even be tempted to forego a case entirely, as Apple proved with the Air by performing a few flashy (but probably not very rigorous) drops.

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In terms of this phone, the hinge receives the most attention, with Prosser revealing that it is constructed on a liquid-metal design that relies on custom 3D-printed pieces and a unique plate that disperses any strain or stress. The crease depth is roughly 0.15 millimeters, so it’s not fully gone, but it’s less obvious in regular use, with the inner display looking practically seamless. This is the same architecture that allows the phone to be so thin while still feeling so robust.

Screen sizes follow a nice pattern, with a compact outer panel and a significantly larger inner one. Expect something around 5.5 inches on the exterior and 7.8 inches on the inside, with a larger aspect ratio and more tablet-like design than a regular phone. When closed, it behaves similarly to any other iPhone, but when opened, it transforms into a tiny tablet that you can still easily carry in one hand. According to Prosser, Apple actively pushed developers at WWDC to stop designing for the same old fixed sizes and orientations, and code strings for fold state and angle degrees are already appearing in iOS 27 builds to match the updated hardware.

Cameras are kept very practical rather than striving for the ‘largest and flashiest’ approach, with a dual setup on the rear consisting of a 48-megapixel main and ultra-wide lens lying on a horizontal plateau reminiscent of the Air. There is no telephoto lens in sight since there just isn’t enough room. When the phone is closed, the front-facing selfie camera handles calls and other functions. Some prototypes have placed the camera underneath the display, allowing it to disappear while the device is open, yet the physical Camera Control button remains, albeit taking up interior space.

Power comes from an A20-series chip paired with a large 12 gigabytes of RAM, which should be sufficient for Apple’s AI tasks. There is also an in-house C2 modem, which enhances efficiency and provides satellite communication. The battery capacity appears to be the highest of any iPhone so yet, built around some high-density cells in the 5,800 milliamp-hour area. Face ID is no longer available because there is no physical space for that hardware in this tiny body, however Touch ID returns in the power button.

Software receives as much attention as hardware. Split screen mode now appears on the large inner screen, and it is a long-awaited feature that makes the larger display more functional than just something to show off; running two programs side by side is the new normal. Everyday operations, such as watching a video while answering messages, no longer require awkward workarounds and instead become second nature.

The price is rumored to be far higher than $2,000, and may even exceed $2500 for those with higher end storage levels, putting the Ultra in a league far above the Pro Max. Apple has not confirmed anything, and has even sued Prosser for some previous leaks he did, but the sheer volume of matching code references, WWDC clues, and all the physical facts he has matching up is keeping the whole story alive.