Hutchison 3G UK Ltd is a British telecommunications and internet service provider currently based in Reading, England. It is a subsidiary of CK Hutchison Holdings, operating under the global Three brand. Three is the fourth-largest mobile network operator in the United Kingdom, with about 9.5 million subscribers as of 2021. The company launched on 3 March 2003 as the United Kingdom's first commercial 100% 3G network. It provides 3G, 4G and 5G (certain areas) services through its own network infrastructure.