From the Royole FlexPai to the iPhone Duo: How the modern foldable phone has evolved

Apple's iPhone Duo likely forecasts a shift in the market toward foldables becoming more common. But it took a while to get here.

Apple&#39;s iPhone Duo likely forecasts a shift in the market toward foldables becoming more common. But it took a while to get here.<p><img src="https://www.engadget.com/img/gallery/from-the-royole-flexpai-to-the-iphone-duo-how-the-modern-foldable-phone-has-evolved/intro-1791988871.jpg" /></p>