But I guess, a century ago, being able to see each other live on a handheld device would have seemed supernatural as well.

Dick Tracy Comic, from quick search: The strip made its debut on October 14, 1931, in the Detroit Mirror. He had a wrist watch that had a screen, so we may have to start thinking two centuries ago now.

I for one would not like to see telepathy ever come to fruition. There are so many people easily controlled with the current technology we have that giving those in power, or wanna be in power, people another tool to make it easy on them does not sound like a good Idea to me.