Though the first electrical telegraphs were invited in 1816, telegrams were still sent through 2013, when BSNL, India's state-owned telecommunications service, ended their services!
Most services ended with in the 1950s, during a fight for relevance between Western Union and Bell. Ads from the time are almost as snappy as a telegram!
Why do you think this documentary begins with:
The alphabet and writings seems to have lost its meaning. The loss of written communication as we know it is indeed a scary thought.
What technologies were changing writing in 1996?