It's a good start. It'll be a lot more useful when it's more flexible rather than smaller - then you could have a regular phone where you could extend the screen when you wanted a bigger display.
https://www.bbc.com/news/av/technology-45364434/tablet-bends-like-ancient-scroll
I wanted a smartphone with an unrollable touchscreen ever since I saw one of those in a (otherwise mediocre) SF show in the '90. And smartphones weren't even a thing.
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