Apple's foldable screen iPhone faces engineering bottlenecks, risking delays in its mass production schedule.

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Apple’s first foldable iPhone is facing technical difficulties in its engineering test phase, raising the risk of delays to its mass production and shipping timeline. This unexpected setback could impact the tech giant’s carefully crafted market strategy around foldable screen products.

According to a Tuesday report by Nikkei Asia, several sources revealed that the engineering development issues with the foldable iPhone are more complex than Apple expected, and taking longer to resolve than anticipated, with the worst-case scenario seeing the first shipments delayed by several months.

Some component suppliers have already been notified that there is a possibility of rescheduling production of parts for the foldable iPhone.

“There were more problems than expected in the early trial production stage, requiring extra time to solve and make necessary adjustments... The current situation may put the mass production timeline at risk,” said one source. The source further noted, “April will be the critical phase for engineering validation testing; the window from this month to early May is extremely crucial.”

Engineering challenges are the root cause, unrelated to supply chain shortages

Another source explicitly stated that this potential scheduling delay is not related to component or material supply shortages, but stems from engineering and technical challenges unique to Apple’s first foldable iPhone.

“Apple and the supply chain are working under pressure, but current solutions are still not enough to thoroughly overcome the engineering obstacles... More time is needed,” the person said. Every new iPhone model needs to go through a strictly planned process step by step in order to be shipped as scheduled by the end of September.

This process includes: new product introduction, engineering validation testing, development validation testing, production validation testing, trial production, and mass production. Each validation phase involves thousands to hundreds of thousands of test units to identify and fix engineering or design problems, while optimizing the manufacturing process to ensure tens of millions of phones are produced smoothly and efficiently.

The foldable iPhone is the strategic focus of Apple’s 2026 product line

Apple has already adjusted its 2026 iPhone launch strategy, delaying production of standard models to early 2027, in order to prioritize the high-end models including the foldable iPhone, and to better allocate limited key resources such as memory chips.

According to a Nikkei Asia supply chain survey of industry executives and market experts, Apple plans an initial production of about 7 to 8 million foldable iPhones. The Cupertino, California-based tech giant has high hopes for this year’s iPhone launch, expecting its first foldable product to stimulate broader demand for the entire product line.

The foldable iPhone will account for less than 10% of Apple’s initial new product line production this year. Even so, various parties in the supply chain are still anticipating strong sales performance—as introducing this new form factor requires a comprehensive upgrade of equipment, materials, and components, bringing higher profit margins for suppliers.

Several suppliers said they hope Apple’s entry into the foldable market will boost the entire foldable smartphone sector and encourage consumers to upgrade to higher-end devices. Major competitors Samsung Electronics and Huawei have launched multiple generations of foldable smartphones since 2019. Research agency IDC predicts that, driven by Apple’s expected entry, foldable smartphone shipments will grow by about 30% in 2026. IDC data shows global shipments of foldable smartphones in 2025 will reach around 20.6 million units, up about 10% from 2024.

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