Cellphones (1909)
In the early 20th century, home telephones were still a relatively new innovation. So it was audacious for Nikola Tesla, an engineer and inventor who briefly worked with Thomas Edison, to suggest, in 1909, that someday people would be walking around with phones in their pockets.
But, as he explained to The New York Times, “It will soon be possible to transmit wireless messages all over the world so simply that any individual can carry and operate his own apparatus.”