I always imagined travelling back in time 100 years and trying to explain our tech.
-"We have personal communicators available at all times, that we can use to instantly communicate with anyone on Earth."
-"Wow! But I guess language barriers make it impossible?"
-'No, actually. A surprising amount of people in the world understand English. Also, we have instant translators in our communicators. I could contact someone in China right now and have a conversation about anything."
-"Incredible!! What sort of topics do you talk to them about?"
-"...I don't. It's kinda impolite to just start talking to strangers. I mostly talk to old friends from school. And my family."