Science Fiction vs. Science Fact

With a 7 year old boy in the house, we've been on a Star Wars watching binge of late. I've been bombarded with questions about Star Wars, and

1. I can only answer questions about the first three movies (IV, V and VI), because I never saw the last three (I, II, and III)
2. For some reason, I can't remember a lot about the first three movies even though I did see them. It was almost 30 years ago...

While watching the movies, Angela pointed out something quite interesting: No one in science fiction movies has a cell phone. The most ubiquitous piece of technology, and no one saw it coming.

We were at the Science Fiction Museum in Seattle a few weeks ago and they had an original Star Trek communicator on display. I whipped out my iPhone to compare: The iPhone is about the same width and height, and about a third the thickness. And it does way more than even Spock can trick out a communicator to do.

The only science fiction that comes close to current technology that I can think of is the Hitchhiker's Guide to the Galaxy. Wikipedia serves a very similar role the to HHGTTG, minus the voice interface and the words "Don't Panic" written in large friendly letters on the cover.