In September 2019 Nubia unveiled the Alpha - smartband that turns into a smartphone - with a foldable OLED display. Nubia said it will launch its Alpha foldable smartband by the end of 2018, but later updated the launch date to April 2019.
Nubia has started to accept pre-orders for the Alpha which will start shipping tomorrow in China only for now - for 3499 Yuan (around $520). The first device to ship is the Bluetooth variant - and Nubia plans to release an eSim variant which will cost around $625 and will launch in Q3 2019.
The Nubia Alpha uses a 4-inch 192x960 foldable AMOLED display wrapped around the smartwatch bands. The producer of this OLED display is China-based Visionox.