The idea of using a lens from a “real camera” on a smartphone is not new. There have been a number of adapters announced over the years with some as far back as 2014 and older. Most of them haven’t really had an amazing reception, which is why they’re not really all that mainstream today. But mobile photography has come a long way since those early devices. Now, there are a number of 3D printable adapters and other options out there to do this.
Xiaomi, though, is doing away with adapters completely and building an interchangeable lens mount right into the phone itself. Their newest 12S Ultra concept phone sports a Leica M mount with a 1-inch 50.3-megapixel sensor.