Comment on You’ll never guess who made the first wireless telephone by The First Wireless Telephone | Irreal

[…] The answers are surprising and not at all what you might have expected. If you’re like me, something involving radio is probably popping into your mind. But that’s entirely wrong. The first wireless phone used light—actually reflected sunlight—to carry the signal. You’ve probably heard of the technology. Back before computers, young nerds used to experiment with light-based phones (you could even buy kits). They were not, of course, terribly useful because of their limited range and line of site requirement, but they did see use in World Wars I and II as a secure alternative to radios for short range communications. And, of course, the idea forms the basis of today’s ubiquitous fiber optics cable. […]