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A staff member demonstrates a "5G smart T-shirt" at the booth of Chinese tech company ZTE at Mobile World Congress 2021 (MWC21) in Barcelona, Spain, June 29, 2021. One of the star technologies on show at the MWC21 Barcelona this week was 5G, the fifth-generation technology standard for broadband cellular networks. Companies present at the major international trade fair that was called off last year due to the pandemic brought along an array of 5G-based technology solutions to the event that took place between June 28 and July 1. (Xinhua/Zhang Cheng)
