Foldable iPhone Ultra 2026: 4.5mm Thin Design, Full Specs, Price — Everything We Know

Apple’s most ambitious iPhone yet is reportedly taking shape. The company’s first foldable smartphone — expected to be called the iPhone Ultra or iPhone Fold — features a design that makes it not only Apple’s thinnest iPhone ever, but potentially the thinnest foldable smartphone from any manufacturer when unfolded. Multiple sources, including leaker Jon Prosser and case manufacturer supply chain data, point to a remarkable 4.5mm profile when open — thinner than the current 13-inch iPad Pro (5.1mm), thinner than the iPhone Air (5.6mm), and considerably thinner than any existing foldable phone.

The 4.5mm Engineering Challenge

Achieving 4.5mm thickness when unfolded in a book-style foldable device requires solving multiple intersecting engineering problems simultaneously. The display stack must be thin enough that folding does not create excessive mechanical stress on the OLED layers. The hinge mechanism must be precise enough to maintain flatness when open while providing a smooth fold. The battery, while needing to fit in a thinner enclosure than conventional iPhones, must deliver all-day performance at premium-tier usage levels.

Apple’s solutions, according to leaked design documents and supply chain sources:

• Liquid metal hinge — harder and more precisely machinable than conventional metal alloys, enabling tighter tolerances that minimise visible creasing and maintain flatness when open
• 3D-printed hinge components — additive manufacturing allows Apple to achieve structural geometries not possible with traditional machining, contributing to the hinge’s precision without adding weight
• Near-creaseless Samsung OLED panel — Samsung Display developed a panel specifically to Apple’s requirements, with metal plates beneath the display to maintain a flat surface when unfolded
• Titanium-aluminium frame — combining titanium’s strength-to-weight ratio with aluminium’s machinability for a lightweight but rigid chassis

When folded, the device reaches approximately 9–9.5mm — slightly thicker than a standard iPhone at 8.5mm, but compact enough to pocket and carry normally.

Display Specifications

The iPhone Ultra features a dual-display system:

The 4:3 aspect ratio of both displays is a deliberate departure from the tall, narrow 9:16 format used by Samsung’s Galaxy Z Fold series. Apple’s approach creates an experience closer to a compact iPad when opened — wider and better suited to document editing, split-screen productivity, reading, and media consumption than the narrower competing designs.

Processor and Performance

The iPhone Ultra is expected to be powered by the Apple A20 Pro chip manufactured on a 2nm process node — the same generation chip expected in the iPhone 18 Pro and Pro Max. The A20 Pro represents a significant generational improvement in performance-per-watt over the current A18 Pro, with enhanced neural engine capabilities for Apple Intelligence AI features and improved GPU performance for the larger display.

RAM is expected to be 12 GB — more than the standard iPhone 18 configurations — to support the multi-window, split-screen, and AI processing demands of the larger form factor.

Camera System

The camera system is necessarily constrained by the foldable form factor. Current leaks indicate:

• Two 48MP rear cameras — wide and ultrawide — mounted on a long, thin camera island on the back
• No telephoto lens — the foldable chassis geometry does not accommodate a periscope telephoto lens in the first generation; this is a notable trade-off for a device at this price point
• Two front cameras — one for use when folded (visible through the outer display), one optimised for the fully unfolded portrait orientation

Battery — Largest Ever in an iPhone

Despite the ultra-thin profile, leaks suggest Apple is targeting a battery in the 5,000–5,500 mAh range — the largest battery capacity ever shipped in an iPhone-form-factor device. The iPhone 16 Pro Max uses a 4,685 mAh battery. Achieving this in a 4.5mm thin unfolded device requires a very high energy density battery configuration — likely split across multiple cells within the two halves of the foldable chassis.

Fast charging is expected at 30W or higher, with MagSafe wireless charging capability — though leaked case designs raise questions about whether internal MagSafe magnets are present (they may be in the case rather than the device itself to achieve the ultra-thin profile).

MagSafe Question — A Potential Compromise

Leaked case designs for the iPhone Ultra/Fold include MagSafe magnets in the case itself — suggesting the device may omit internal MagSafe magnets to achieve the 4.5mm thin profile. If accurate, this would mean MagSafe accessories work only when the case is attached, rather than directly with the device. Apple last made this trade-off with the iPhone 16e (2025), though it reversed the decision for the iPhone 17e. The final production design remains unconfirmed.

Pricing and Availability

The foldable iPhone Ultra is expected to launch in September 2026 alongside the iPhone 18 Pro and iPhone 18 Pro Max. Initial production is reportedly limited to approximately 10 million units — a deliberate premium positioning strategy. Starting price is estimated at $1,999, placing it in direct competition with Samsung’s Galaxy Z Fold 6 (approximately $1,900). Some analysts suggest shipments could slip to October or December 2026 if production ramp challenges arise.