Apple appears to be developing two potential folding iPhone formats, with the iPhone Fold leading in development. Industry sources suggest the book-style model has advanced to engineering validation & testing, with approximately 100 prototypes manufactured for evaluation.

The iPhone Fold would unfold to a size similar to an iPad mini, while the iPhone Flip would adopt a clamshell design reminiscent of the Motorola Razr. Bloomberg's Mark Gurman confirms Apple is considering the Flip, though reports remain vague about how developed this alternative design might be.

At present, Apple has confirmed neither product, leaving consumers to speculate about which form factor might eventually reach market. The company's apparent dual-track approach suggests it's evaluating multiple directions before committing to a specific folding iPhone strategy.