Apple is reportedly struggling to ramp up production of the iPhone Duo ahead of its October launch, with final assembly yields at Foxconn said to be only slightly above 60%.
The figure suggests Apple’s first foldable iPhone remains significantly more difficult to manufacture at scale than a mature iPhone production line, potentially limiting the number of devices available during the opening weeks of sales.
According to a report from Chinese publication Jiemian News, citing a source close to Foxconn’s supply chain, the finished-device assembly yield for iPhone Duo was only slightly above 60% as of September 17, with initial production volumes described as relatively small.
Manufacturing yield refers to the proportion of devices coming off a production line that successfully meet the required standards. A yield slightly above 60% does not mean that around 40% of iPhone Duo devices sold to customers will be defective. Instead, it means a substantial proportion of units aren’t passing Apple’s production requirements on the first attempt, making the device slower and more expensive to manufacture.
The source told Jiemian that, under Apple’s existing quality standards, it could take between six months and a year for the iPhone Duo production line to reach what it considers a mature yield.
Foxconn is reportedly continuing to adjust equipment, processes and production parameters as manufacturing ramps up.
The report claims suppliers are also waiting to see whether Apple will relax any of its quality requirements to allow production to scale more quickly. There is no indication that Apple has agreed to do so.
Final assembly isn’t the only part of the supply chain said to have caused difficulties.
Jiemian reports that foldable OLED panels supplied by Samsung Display and components used in the iPhone Duo’s hinge have previously experienced low yields, delayed deliveries and changes to their designs.
Delays further up the supply chain can leave Foxconn with less time to optimize its own assembly lines before production needs to reach full scale.
The hinge has been one of the most technically challenging parts of Apple’s first foldable iPhone. Apple says the mechanism contains more than 100 individual components and uses a 3D-printed cover.
The company also experimented with Liquid Metal for parts of the hinge during development, according to the report, before reassessing the approach ahead of mass production.
Despite the reported manufacturing difficulties, Apple is still preparing millions of iPhone Duo units for its first year on sale.
A supply-chain source cited by Jiemian claims Apple’s global stocking target for the iPhone Duo during 2026 is approximately six million to eight million units.
For comparison, the report says an individual mainstream iPhone Pro or Pro Max model can typically ship between 20 million and 30 million units over a full product cycle.
A separate source in the retail channel said Apple’s sales guidance for the iPhone Duo exceeds five million units.
The lower production target isn’t necessarily surprising. The iPhone Duo starts at $1,999 in the United States and arrives later than Apple’s other new iPhones, giving it a considerably shorter sales window during 2026.
Apple will open iPhone Duo pre-orders on October 16, with the first devices scheduled to reach customers and Apple Stores on October 23.
There is currently no indication that those dates have changed because of the reported production problems.
The bigger question is availability. If yields remain low as Foxconn ramps production, particular storage capacities or configurations could become difficult to find soon after pre-orders begin.
That won’t become clear until orders open next month, but with the iPhone Duo representing Apple’s first attempt at manufacturing a foldable iPhone at enormous scale, its early supply will be worth watching closely.