Hutchison Telecommunications Hong Kong Holdings Limited, an investment holding company, provides mobile communication services. It offers 5G, 4G long term evolution, 3G, and GSM dual-band mobile telecommunications under the 3 brand. The company also provides mobile telecommunications services and products include local voice, SMS, MMS, international direct dialing, and international roaming; and data services and applications, such as direct carrier billing offerings, mobile device security management, eBooks, music downloads, movies-on-demand, mobile social networking applications, and FinTech, as well as Wi-Fi and other value-added services. In addition, the company is involved in the provision of marketing, advertising, and promotional services; and telecommunications retail operations. As of December 31, 2021, it served approximately 3.2 million customers in Hong Kong and Macau. The company was incorporated in 2007 and is headquartered in Central, Hong Kong. Hutchison Telecommunications Hong Kong Holdings Limited is a subsidiary of CK Hutchison Holdings Limited.