The iPhone Duo is reportedly facing production difficulties ahead of its October launch, with early output expected to be limited. A person said to be close to Foxconn's supply chain told China's Jiemian News that final assembly yields for Apple's first foldable iPhone were only slightly above 60% as of September 17. The source said that, under Apple's current quality standards, it could take another six months to a year for the assembly line to reach a mature yield.