iPhone Duo?

While the long-awaited foldable iPhone has often been referred to as the iPhone Ultra or the iPhone Fold in rumors, another name making the rounds is iPhone Duo. There is no actual evidence that Apple will use the iPhone Duo name, but it is certainly a possibility. Apple has used Duo branding in the past, for its PowerBook Duo line…

Summary from the MacRumors feed. The full story lives on their site.