Making millions of iPhone Duos is proving harder than Apple hoped

Only Apple knows what it expected for yields, but manufacturers are claiming that the iPhone Duo is difficult to manufacture at scale, with its folding screen and hinge complicating production.
iPhone Duo production struggles as assembly yields suffer
Assembly yields for the iPhone Duo remain low, while component delays have shortened the time available to refine production. Apple now faces a familiar foldable phone problem: producing millions of units that reliably work.Foxconn's iPhone Duo ass