The camera rotated with the screen so that the same sensor could face both forward and rear  In 2017, ZTE released the Axon M with a similar hinge to the Medias W. ZTE stated that the more powerful hardware of modern smartphones, and improvements to multitasking and tablet support on Android, helped to improve this experience. The development of thin, flexible OLED displays enabled the possibility for new designs and form factors. During its Consumer Electronics Show keynote in 2013, Samsung presented several concepts—codenamed Youm—for smartphones incorporating flexible displays. One such concept was a smartphone that could fold outward into a single, uninterrupted tablet-sized display. The first Youm concept to make it to a production model was the Galaxy Note Edge—a phablet with a portion of the screen that sloped over the right-hand bezel. Speculation surrounding the development of folding phones using OLED displays began to emerge more rapidly in 2018. In January 2018, it was reported that LG Electronics had obtained a design patent for a folding smartphone. Later in June, it was reported that Microsoft had been developing a similar device as part of its Surface line, codenamed "Andromeda" (itself a spiritual successor to a dual-screen booklet tablet prototype Microsoft had been exploring in the late-2000s known as Courier), while Samsung was also said to be developing such a device. In November 2018, the Chinese startup Royole and released the first commercially available foldable smartphone with an OLED display, the Royole Flexpai. It featured a single 7.8-inch display that folds outwards, leaving the display exposed when folded. Later that month at its developers' conference, Samsung officially teased a prototype of its folding smartphone, which would be produced "in the coming months". The prototype used a booklet-style layout, with an "InfinityFlex" display located on the inside of the device, and a smaller "cover" screen on the front of the device to allow access when the screen is closed. At a concurrent developers' summit, Android VP of engineering Dave Burke stated that the next version of the platform would provide enhancements and guidance relevant to folding devices, leveraging existing features. In January 2019, Xiaomi CEO Lin Bin published a video on Sina Weibo, featuring him demonstrating a prototype smartphone with two flaps capable of being folded inward. Samsung officially unveiled the Galaxy Fold during its media event at Mobile World Congress in February 2019. Alongside the Galaxy Fold, the convention also saw other foldable phones being unveiled or teased, such as the Huawei Mate X, and TCL presenting various prototype concepts featuring its "DragonHinge" technology (including a braclet-styled device).