“Apple has been granted a patent by the United States Patent and Trademark Office (USPTO) for a virtual-reality (VR) headset designed to accommodate an iPhone as its display. The device, entitled “Head-mounted display apparatus for retaining a portable electronic device with display” in the patent documents, which were first mentioned by Apple Insider, is described as a head-mounted display system that can be physically coupled with a handheld portable electronic device.” [1]
[1] Leon Spencer for ZDNet