I think this is getting at an interesting point. Over the past decade smartphones undertook a rapid and seem less evolution from a fancy gadget into what's now basically a full fledged minature computing device. It still looks relatively the same, but now has a fundamentaly different role in our daily lives, for better or for worse.
A phone cannot replace a computer until that happens. (at least for people like me)
It's a "present"/"past-future" that Microsoft envisioned years back that we have all the technical solutions, just not all the practical solutions. Android is too fragmented to sell such a vision wholesale across the platform, and Apple too disinterested, too invested/stuck in keeping devices to specific niches (because it sells more devices).
That's kind of the future of the word that AT&T envisioned back in the 1950s and 1960s Worlds Fairs and Advertising strategies, so it has a weird retro sci-fi charm here as well, were that to happen.
(Though I'm very pro reusing old, small tech words in new ways. I very much advocate that we should recycle "facsimile machine" aka "fax machine" to mean "3-D Printer", giving us the word "fax" back as "thing I 3-D printed", which currently doesn't really have a good word.)