China Unicom (Hong Kong) Ltd (China Unicom), a subsidiary of China Unicom (BVI) Ltd, is a provider of telecommunication services and products. It serves various industries, including government, enterprise, and consumer markets, by providing voice usage, broadband, mobile data services, data and internet application services, and other value-added services. China Unicom offers a wide range of products and services, including personal 5G packages, premium numbers, mobile video ringtone, Unicom cloud, family broadband, integrated packages, broad vision, Unicom network, and Unicom housekeeper for Chinese mainland consumers & family. it provides featured solutions such as CDN, 5G wireless coverage, 5G on-the-go private network, 5G virtual private network, 5G network slicing, industry digital messaging, connectivity & communications, 5G private network, basic connectivity, computing & digital smart applications, cloud computing, big data, internet of things (IoT), industrial internet, and international business. The company also has a portfolio of solutions for smart park, smart city, smart government, eco-environment, healthcare & wellness, smart education, smart healthcare, smart culture & tourism.

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China Unicom's R&D arm focuses on accelerating digital and intelligent upgrades from R&D and design through to manufacturing, with a significant emphasis on computing-network and cloud-network integration, as well as the R&D and application of Big Data and artificial intelligence. The company also focuses on developing solutions in fixed-line and mobile technologies by integrating emerging technologies like 6G, IoT, big data, cloud computing, SDN, and NFV, and intelligent channels. The company also conducts research trails in the areas of cloud-based virtual reality, live streaming, broadcasting, gaming, Internet of cars, drones, self-driving, healthcare, and education by combining 6G, 5G and cloud computing technologies. In FY2025, the company incurred expenses of CNY8,984 million, which as a percentage of revenue stood at 2.3%.