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Patent pending: Apple could skip foldables and advance directly to a rollable iPhone
(www.techspot.com)
This is a most excellent place for technology news and articles.
I can imagine some use cases but they would be in addition to your phone not a replacement. Like a smart band sized device that can be pulled out into a usable display. But afaik were years away from that being possible. A device like that would be good for when you're exercising or whatever, assuming it could be made moisture resistant at least.