New York, New York - Samsung is bringing flip phones back with a new generation of foldable devices as the tech giant continues its push to make flexible screens mainstream.

The company used its Unpacked virtual event to announce the Galaxy Z Fold4 and Galaxy Z Flip4, with some help from K-pop sensation BTS.

The Fold is a traditional-sized smartphone which opens horizontally, like a book, to reveal a larger, tablet-sized screen. The Flip is a smaller device which opens vertically to reveal a nearly 7-inch smartphone display.

The Fold4 has been given a substantial camera upgrade and features the triple camera system found in Samsung's flagship S22 handset, while the cover screen on the outside has been slightly increased in size and a new PC-style taskbar has been built into the software to speed up jumping between apps.

The Flip4 upgrade is more modest, with improvements to the small cover screen used to view notifications when the device is closed and expanded camera features when the phone is open, enabling users to change the layout of the viewfinder and get different camera angles.

The two phones will also come with better battery life – and an eye-watering price. The Flip4 will start at $999 and the Fold4 at $1,799. Both will go on sale on August 26. Meanwhile, both fans of the company and BTS ARMY members are invited to NYC's Times Square for a special treat: a live performance from the ultra-popular group to celebrate the lauch!

Wednesday's Unpacked event also saw the unveiling of the Galaxy Watch5 and Watch5 Pro, as well as a new set of wireless earphones, the Galaxy Buds2 Pro.