Apple can work on the iPhone in a fully glass case, the entire surface will be a touch screen.
On the Web, they found an Apple patent describing the design of the iPhone in a fully glass case. According to the Apple Insider portal, the document talks about a device that might appear to be made from a single piece of glass, although it may actually consist of several pieces connected together.
Such an iPhone, according to information from the patent, can have transparent side ends and a back panel that will allow you to equip your smartphone with additional screens that will be visible from the side and back; moreover, these screens, as indicated in the patent, can be touch-sensitive (thus, perhaps, the usual buttons will be replaced by touch areas).
Of course, at the moment we are only talking about a patent - no more: whether Apple will ever release such a device is unknown.