Although Samsung (or actually Royale) started it last year, it was only really this year that foldable phones truly took off, with the more mature Galaxy Z Flip 2 and the Motorola Razr 5G. But even before the seemingly futuristic smartphone can really take hold of the market, it seems that another unconventional design might be arriving next year.

Depending on how the first generation solves design and engineering problems, rollable phones could actually offer a more economic and more practical alternative to foldable phones.
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https://www.slashgear.com/rollable-phones-could-give-foldables-a-run-for-their-money-03649727/