I have to correct a tragic misconception about Kirk’s communicator from Star Trek (that little box Kirk and Spock use to call the Enterprise from the planet’s surface).
It always gets compared to a mobile phone because modern phones are much smaller. It’s become a future prediction gone wrong, much like flying cars or food in pill form. However, people don’t take in consideration what these devices actually do: one relies entirely on a massive network of antennae and the other singlehandedly messages an orbiting spaceship thousands of miles away. Personally I think they got it wrong, but exactly the opposite way. That communicator should probably look more like a Mobira Cityman than a flip phone.