China Unicom

China Unicom is a state-owned telecommunications operator in China and the third-largest mobile provider in the country by subscriber base. Together with China Telecom and China Mobile, the company helped roll out the country's 5G network, and it is involved in the development of 6G for launch by 2025. Outside China, the company has opened more than 30 branches, but it was banned from operating in the US in 2022 over national security and spying concerns.