Apple's long-awaited foldable iPhone may be delayed by months due to technical issues in its engineering tests. The tech giant's smartphone is expected to feature a screen about the size of an iPad mini when fully unfolded and an external screen roughly the same size of a small iPhone when closed. This delay could impact Apple's marketing plan for the device, which is already seven years behind Samsung's Galaxy Fold. The folding iPhone is designed to keep Apple competitive with rivals like Samsung and offer a device more conducive for watching videos. The device is expected, running on standard iOS rather than iPad-specific software, and will allow for iPad capabilities such as two apps side-by-side.