Star Trek communicators and tricorders come pretty close, but then again that was predicted for the 23rd century. One beef I have about The Expanse is that they

Star Trek communicators and tricorders come pretty close, but then again that was predicted for the 23rd century. One beef I have about The Expanse is that they have cell phones, albeit fancy holographic ones. Not sure we will still be using that paradigm, we may have moved into wearable devices or something involving direct brain communication by then. We are already on the verge of that.