> Not convinced of the point that these inventions "come from science fiction", sci-fi popularizes and speculates about the future of current science and technology, it doesn't invent the science and technology. Cell phones have existed in experimental forms since the 1940s[0] so they certainly weren't invented by Gene Roddenberry, he just speculated that they would become smaller and more powerful.

To amplify your point: it's worth noting that the Star Trek communicator was depicted as a compact, extremely long range two-way radio. Cell phones only vaguely resemble them. So even less credit is due to sci-fi.