The iPhone Duo goes on sale October 23, and the production ramp behind it is still unfinished. Foxconn is reportedly getting a whole-device assembly yield in the 60 percent range, which leaves a large share of assembled phones failing Apple’s current quality standard.
The figure comes from a person close to Foxconn’s supply chain, who told Jiemian on September 17 that the first batch of phones is small. That person expects a mature yield under Apple’s current standards to take six months to a year.
The supply chain is now waiting on Apple to decide whether to relax its quality requirements, which would speed up volume production. The person attributes the low yield to Apple building a foldable for the first time, with equipment, process steps and settings still being adjusted while the line runs.
The iPhone Duo Launch Window Is About a Month Longer Than Usual
Apple introduced the iPhone Duo on September 10, with pre-orders on October 16 and a release on October 23. Over the past five years, Apple’s fall flagship iPhones averaged about three days from announcement to pre-order and about 10 days to release. The iPhone Duo takes 36 days to reach pre-orders and 43 days to reach customers.
The folding OLED panel comes from Samsung Display, reportedly at $250 per display. The report says the panel and some hinge parts have had low yields, late deliveries and design changes, which pushed the schedule back. Apple also tested liquid metal in some hinge parts before reevaluating the plan ahead of mass production. Any change in material or process forces other suppliers to redo samples and validation, and a new supplier cannot ramp overnight.
Mizuho Securities made a similar point in a September 3 research note. It said hinge specifications and screen crease problems were slowing production, and that Apple has to balance its quality standard against getting to full-scale manufacturing.
The hinge alone has more than 100 parts, and the tolerances between the screen, hinge and body have to stay tight. Otherwise the result can be a deeper crease, uneven opening resistance or a dented screen. Apple’s hardware chief has already said the hinge was the hardest problem to solve, and the nano-texture inner display adds a second demanding part to the build.
The phone is about 5.2mm thick when unfolded, roughly 0.4mm thinner than the iPhone Air. The hinge takes up the middle of the body, so the battery, motherboard and cooling system sit on either side of it.
Apple’s Stocking Target Is a Fraction of a Normal Pro Cycle
The supply chain source puts Apple’s global stocking target for the iPhone Duo this year at 6 million to 8 million units. A retail channel source says Apple’s sales guidance is above 5 million. The gap to a normal Pro cycle is large.
- The iPhone Duo has a global stocking target of 6 million to 8 million units for 2026
- Apple’s reported iPhone Duo sales guidance is more than 5 million units
- A mainstream Pro or Pro Max model usually ships 20 million to 30 million units over one product cycle
The stocking range sits below the roughly 10 million units suppliers were reportedly told to prepare for earlier this month. It is close to the 7 million units analyst Jeff Pu expects Apple to ship through the end of 2026.
Omdia data cited in the report puts 2025 global foldable shipments at 18.2 million units, up 6 percent and the slowest growth in recent years. That is about 1.4 percent of the roughly 1.26 billion smartphones shipped worldwide, which keeps foldables a niche category. First-half 2026 foldable shipments fell 21.6 percent to 5.1 million, with vertical flip models down 47 percent and book-style models roughly flat.
Industry sources in the report expect Apple’s entry to lift the category, and one analyst thinks iPhone Duo volume could reach 20 million to 30 million units within two to three years as production and software mature.
