Even without the billboard apparently outing Huawei's plans, a folding smartphone from the company was expected at MWC 2019. Rumors of the device have been floating around since the start of the year, and Huawei said last October that it planned to release a folding device at some point during 2019. At a meeting with investors last month, Huawei CEO Richard Yu confirmed the company's plans to bring a folding smartphone to the annual event. "We look forward to seeing you in Barcelona in February, where we will launch the world's first 5G smartphone with foldable screen," he said.

Huawei's folding smartphone will be revealed just days after Samsung showed off its first ever folding device, the Galaxy Fold. Folding screens are expected to be the next big trend in smartphones, with companies like LG and Xiaomi also experimenting with the feature. Royole, meanwhile, have already revealed its efforts to the public -- earlier than everyone else.