OK, I’m going back to my phreaking roots – I’ve been geeking out on this stuff all day. Here’s a clip of a cellular phone system diagram from 1947, off AT&T site:

AT&T develops the concept of cellular telephony. The technology to realize the concept did not yet exist.

And… here are some links:

For extra fun, here’s a phone recording of “Call Cannot Be Completed” (.mp3)