My eighteen year old just learned what a phone busy signal sounds like. He had never heard it before.
We knew cars had to be cranked up to start, even though those cars were no longer produced. We knew about the milk man, the ice man, the lady plugging in stuff to hook up telephone calls, etc., even though those entities were long gone.
You would think that in this day and age of the Internet and information age, today's teenager would be more in tune with how technology functioned a mere 20 or so years ago, not less. That doesn't seem to be the case.