Apple’s upcoming iPhone Duo will be compatible with the existing Apple Pencil USB-C, though this wasn’t the company’s original plan. Initially, Apple had designed a unique, smaller stylus specifically for the iPhone Duo, a foldable smartphone. This stylus was meant to attach directly to the side of the device’s hinge, but the company faced technical challenges that led them to abandon the idea. The development of this custom stylus required significant effort and time during the creation of the iPhone Duo. The decision to switch to the Apple Pencil USB-C was reportedly driven by technical difficulties that arose before mass production could begin. Since the iPhone Duo was not originally designed to work with this stylus, Apple had to develop new software components and conduct internal testing to ensure compatibility. This change delayed the inclusion of Apple Pencil support at the device’s launch, but Apple has since announced that compatibility will be available before the end of 2026. During the iPhone Duo’s official presentation on September 9, Apple confirmed that the Apple Pencil will be compatible with the device by late 2026. However, the iPhone Duo will be sold without a stylus included, starting at a price of 2,339 euros. The device is set to go on sale on October 23. While the iPhone Duo is designed for dual-screen use, the integration of the Apple Pencil will require users to purchase the stylus separately, as it is not included in the initial package.