[ggrelet]

In Dan Simmons' Hyperion, the characters have a device called comlog. It's a portable device which connects to a broad network. It also has the ability to read vital constants.

The author is quite vague about it, no doubt, and that's one of his staples. But he foresaw something human would carry to get connected to other humans and information.

(That book won the Hugo award in 1990)

[danaris]

Neat, and one I haven't heard of! But the existence of one or a small handful of sci-fi authors who happened to predict it doesn't change the fact that they're the exception, few and far between. Search through the vast library of science fiction written in the past century and a half and you will find at least one example of something you can interpret as predicting almost any modern technology. But there are elements that become much more prominent, whether because they become individually well-known, or because they spread through an entire branch of the genre, and nothing that looks particularly like smartphones was among them.