The trick is to invent future tech that feels organic, cohesive, and believable, and not just whatever happens to be needed for the story you’re trying to tell.

Alastair Reynolds is a modern master of this, in my opinion, with a lot of interconnected far-future “stuff” that still basically hangs together.

> If you try to extrapolate current tech 50 years into the future, you'll probably get it wrong and people reading your books during the time it's set in will think it quaint.

I'm now rereading old SF that I first read 40-to-50 years ago. I don't think I've found a single example where an SF author actually got tech right.

go back a bit further though and you'll get to Arthur c Clarke who accurately predicted geostationary communication satellites

Clarke's original prediction, in a 1945 letter to Wireless World, is as follows:

>> An "artificial satellite" at the correct distance from the earth would make one revolution every 24 hours; i.e., it would remain stationary above the same spot and would be within optical range of nearly half the earth's surface.

>> Three repeater stations, 120 degrees apart in the correct orbit, could give television and microwave coverage to the entire planet. I'm afraid this isn't going to be of the slightest use to our post-war planners.

His short story The Sentinel, the precursor to 2001 A Space Odyssey, also has, IIRC, a description of the crew of a lunar rover frying sausages on a hob during one of their missions. And The Deep Range posits mass farming of whales to feed one eighth of the world population. I loved his fiction as a kid but the predictions haven't aged well.

And also a human mission to Jupiter aided by a sentient computer in the year 2001.

As I recall, his communication satellite depiction included humans living on it full time to keep it running. Also not quite how it turned out.

I have the utmost respect for him, but he was not immune to getting the future wrong like other science fiction authors.

Tech broke a LOT and was HUGE back then. Think of it more in terms of value out of the utility. It was valuable enough to do it even with that cost.

Luckily tech improved a lot, so now many more things are possible for much less capitol.

The scene in Neuromancer involving a row of pay phones in the airport seems kind of hilarious today.

It would honestly be nice if airports had 'phone booths' like I've seen in high tech companies. Think 1 person sized meeting rooms in larger spaces. One door on the pod opens, there's a seat and a small desk inside. Enough to make a mostly private phone call.

In a public setting there should also be things like a panic / duress button. A simple lock (that only local security can bypass). Maybe an internal phone line of some sort. Possibly a wired connection to the net DMZ.

I hesitate to add a timer, because _sometimes_ people have real travel troubles while at the airport and need an extended duration to take care of that. Such nuances might not fit within the context of E.G. a 20 min max timer.