Apple’s First Foldable iPhone Reportedly Hits Engineering Delays

Apple’s long-rumoured foldable iPhone has reportedly run into more engineering trouble than the company anticipated, putting its production schedule and launch timing at risk, according to a new report from Nikkei.

The issues are said to have surfaced during early test production of the device and could push back initial shipments by several months, multiple unnamed sources briefed on the situation told Nikkei. One source warned that “the current situation could put the mass production timeline at risk,” describing the period from April through early May as “extremely critical” as Apple pushes through a key engineering phase.

The reported problems emerged during Apple’s production verification tests, the fourth of six internal stages that new hardware must clear before it can ship. Those stages include later pilot production and then full mass production, meaning the foldable iPhone still has significant hurdles ahead.

Because this would be an all-new iPhone design, the device is expected to face a stricter bar than Apple’s typical yearly refreshes. According to the report, it will need to pass each development stage “with flying colors” before Apple greenlights the next phase.

Component suppliers have reportedly been told to expect a delay to the foldable iPhone’s production schedule while Apple works on solutions. One source quoted by Nikkei described the situation as a race against time: “Apple and the supply chain are working under a pressured timeline and the current solutions are not enough to completely solve the engineering challenge… more time is needed.”

The report notes that the engineering verification work taking place around April is a decisive checkpoint. Any extended problems at this phase can ripple into pilot runs and ultimately mass production, which would explain the concern around shipment timing.

A foldable iPhone has been part of the rumour mill since 2017, even as Apple’s main rival in smartphones, Samsung, shipped its first foldable handset back in 2019. According to multiple sources cited by Nikkei, Apple had been targeting a debut for its foldable iPhone in fall 2026, lining it up alongside the expected iPhone 18 family.

There was some caution that the project could slip into 2027 if Apple ran into manufacturing or durability issues, particularly around the hinge or the display. The new engineering snags described by Nikkei appear to fit that risk scenario, even if no revised date has been suggested.

The foldable iPhone is not expected to become Apple’s volume driver out of the gate. Nikkei reports that Apple is planning an initial run of around 7–8 million units, which would represent less than 10 percent of total iPhone output. Even at that scale, the project is framed as strategically important: a flagship product aimed at boosting interest across the iPhone portfolio rather than a niche experiment.

Apple had reportedly been prioritising the foldable iPhone and other premium models for its September event this year, in part because of tight supply for some key components, including memory chips. However, the latest engineering problems could disrupt that internal ranking and force changes to how Apple stages its upcoming launches.

The company has not officially announced a foldable iPhone and declined to comment on the reported engineering challenges, according to Engadget. For now, the device remains unconfirmed publicly, even as details about Apple’s internal timelines and testing hurdles continue to surface through supply chain sources.