Video calling and instant messaging have both been around for ages at this point, and remain stubbornly walled off. Both should qualify as "basics" by now.
Sure, you can still SMS worldwide, as long as they have a cell phone. But non-phone devices are becoming very common. What if you want to send or receive messages on your tablet or computer. (This works OK in the Apple world, but only because they hack it by routing SMS through your phone.)
Video calls don't even have that.
E-mail, for example, was different. I started using online services when you had AOL, CompuServe, Prodigy, etc. all in their own little worlds. That didn't last very long before they all bridged their internal e-mail systems to the internet and everyone could talk to each other.
