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Yes, we've seen foldable phones. We've even seen rollable phone prototypes — although LG's rollable phone, sadly, probably won't see the light of day.

But TCL now has a smartphone concept that's both a foldable and rollable phone in one, and it's pretty cool.

Credit: TCL

The idea is fairly simple — take a foldable phone, similar to Huawei's original Mate X, and then make it rollable on one side so that it extends to something akin to a decently sized tablet. I've been critical of foldable phones precisely because they don't offer that much space when folded out, but this TCL phone solves that in a fairly elegant way.

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In terms of specs, the TCL Fold 'n' Roll is a 6.87-inch phone that folds into an 8.85-inch phablet (remember that word? TCL's still using it). And then, it rolls out into a 10-inch tablet, which should be plenty even for those who like their tablets bigger.

Credit: tCL

TCL shared no other specs — nothing, really, besides a few renderings of the device. There's no word on when it may be launched, either — being a concept phone, one probable answer is never.

Still, TCL has been at this for a while. The company was one of the first to show a working foldable smartphone prototype, and it made several other prototypes over the years. Perhaps Fold 'n' Roll is the one that actually turns into a real product.