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.

Mashable Light SpeedWant more out-of-this world tech, space and science stories?Sign up for Mashable's weekly Light Speed newsletter.By signing up you agree to our Terms of Use and Privacy Policy.Thanks for signing up!

SEE ALSO:Huawei's Mate X2 foldable phone has new Falcon Wing design

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.