There are tons of Bluetooth keyboards, a few folding Bluetooth keyboards, and even a crowdfunded folding Bluetooth keyboard. But almost none of them fit in a pocket just like a smartphone does.
However, the original FlyShark keyboard (also known as the iLepo) broke that barrier with a minimalist, affordable four-line keyboard that offered a quality typing experience. After dabbling in smartwatches, the company has come back to Kickstarter with a new FlyShark keyboard that makes addresses a few issues with the original. The company has made the device a bit thinner, strengthened the hinge and given it a bit more traction to stay put on surfaces. The company also promises a more responsive typing experience.