Visitors try mobile phones and tablets during the Mobile World Congress (MWC) Shanghai 2021 in east China's Shanghai, Feb 23, 2021. The MWC Shanghai 2021 opened on Tuesday. (Xinhua/Fang Zhe)

Visitors stop at a booth of wearable devices during the Mobile World Congress (MWC) Shanghai 2021 in east China's Shanghai, Feb 23, 2021. The MWC Shanghai 2021 opened on Tuesday. (Xinhua/Fang Zhe)

A visitor takes photos of a robot during the Mobile World Congress (MWC) Shanghai 2021 in east China's Shanghai, Feb 23, 2021. The MWC Shanghai 2021 opened on Tuesday. (Xinhua/Fang Zhe)