Apple is facing issues in the test phase of its foldable iPhone that are taking longer than expected to resolve, potentially delaying mass production

Apple's long-rumored foldable iPhone is apparently not going smoothly. Sources say the company is struggling with issues during the engineering test phase of the device — problems that are proving stubbornly difficult to resolve.

The setbacks are taking longer than anticipated to fix, raising the prospect of delays to mass production. For a company that prides itself on meticulous hardware launches, that's not a great sign.

Reports trace the development work to Taipei, suggesting Apple's supply chain partners in Taiwan are deeply involved in ironing out whatever's going wrong. The specific nature of the engineering challenges hasn't been disclosed.

Apple has never shipped a foldable device, making this its first serious entry into a category Samsung and others have been iterating on for years. Every delay widens that gap further.