I remember the days of the Nokia Communicator brick — the second generation. With that thing you could print via an infrared port on the device and your printer. My trusted LaserJet 2200DTN has such an infrared port, so I tried it. It worked, but it was a pain to keep the phone well in sight of the printer’s infrared beam. But they called it mobile printing. Today, with all the tablets and smartphones, mobile printing is back, but now it seems to actually work.