Photo taken on June 28, 2021 shows the Mobile World Congress (MWC) at the Barcelona FIRA Gran Via exhibition center in Barcelona, Spain. The 2021 Mobile World Congress kicked off on Monday in Barcelona. (Photos: Xinhua/Zhang Cheng)

People visit the booth of French telecom company Orange during the Mobile World Congress (MWC) at the Barcelona FIRA Gran Via exhibition center in Barcelona, Spain, June 28, 2021. The 2021 Mobile World Congress kicked off on Monday in Barcelona.

A woman demonstrates the "5G+AR" technique at the booth of Chinese tech company Huawei during the Mobile World Congress (MWC) at the Barcelona FIRA Gran Via exhibition center in Barcelona, Spain, June 28, 2021. The 2021 Mobile World Congress kicked off on Monday in Barcelona.

A visitor tries an AR game at the booth of Chinese tech company Huawei during the Mobile World Congress (MWC) at the Barcelona FIRA Gran Via exhibition center in Barcelona, Spain, June 28, 2021. The 2021 Mobile World Congress kicked off on Monday in Barcelona.

People visit the Mobile World Congress (MWC) at the Barcelona FIRA Gran Via exhibition center in Barcelona, Spain on June 28, 2021. The 2021 Mobile World Congress kicked off on Monday in Barcelona.

Spain's King Felipe VI (C) visits the Mobile World Congress (MWC) at the Barcelona FIRA Gran Via exhibition center in Barcelona, Spain, June 28, 2021. The 2021 Mobile World Congress kicked off on Monday in Barcelona.

People queue to enter the COVID-19 test center at the Barcelona FIRA Gran Via exhibition center in Barcelona, Spain, June 28, 2021. The 2021 Mobile World Congress kicked off on Monday in Barcelona.

A staff member presents the ZTE 5G smart T-shirt at the booth of Chinese tech company ZTE during the Mobile World Congress (MWC) at the Barcelona FIRA Gran Via exhibition center in Barcelona, Spain, June 28, 2021. The 2021 Mobile World Congress kicked off on Monday in Barcelona.

People communicate at the booth of Chinese tech company Huawei during the Mobile World Congress (MWC) at the Barcelona FIRA Gran Via exhibition center in Barcelona, Spain, June 28, 2021. The 2021 Mobile World Congress kicked off on Monday in Barcelona.

People visit the booth of Chinese tech company Huawei during the Mobile World Congress (MWC) at the Barcelona FIRA Gran Via exhibition center in Barcelona, Spain, June 28, 2021. The 2021 Mobile World Congress kicked off on Monday in Barcelona.

People try a ZTE 5G smartphone at the booth of Chinese tech company ZTE during the Mobile World Congress (MWC) at the Barcelona FIRA Gran Via exhibition center in Barcelona, Spain, June 28, 2021. The 2021 Mobile World Congress kicked off on Monday in Barcelona.