I might as well start where the conversation started in the first place. In 100 years, will we still have phones? Assuming mankind doesn't evolve some sort of telepathy, we’re going to need a way to communicate. It may look increasingly less like a phone. It might look more like a video phone. It might splinter into home communications that aren't phones and handheld communication that are. But the only way I see the phone disappearing is if we have computers implanted in our brains. As much as I’d like to think I’ll live to see that, I probably won’t.
Verdict -- Another century.
(Image: blickpixal)