HKT Trust and HKT Limited, an investment holding company, engages in the provision of technology, and satellite-and network-based telecommunications and related services in Hong Kong, Mainland China, and internationally. The company operates through Telecommunications Services, Mobile, and Other Businesses segments. It offers voice and unified communications, such as Local business telephone services, one communications, Smart value added services (VAS) for business communications, international telephone services, smart VAS for cross border communications, conference fixed-mobile integration, customer communication management, business continuity and communication security services; data connectivity, including leased lines, optical data services, optical data services, dedicated cloud connectivity, and payment solutions for banks; and enterprise communications solutions, audio visual solutions, office solutions, data infrastructure, professional services and maintenance, and video surveillance solutions. The company also provides broadband services, Wi-Fi, cloud office and hosting, anti DDoS; mobility security, fixed-mobile integration, collaboration, mobile business solutions, and other mobility solutions; cutting-edge facility management services; merchant payment solutions; Virtualisation and cloud; and call center outsourcing. In addition, it offers fixed line service and IDD services, internet, infotainment, esmarthealth, as well as home automation, home network, home entertainment, consumer electronics, smart living online shop services. The company was incorporated in 2011 and is headquartered in Quarry Bay, Hong Kong. HKT Trust and HKT Limited operates as a subsidiary of CAS Holding No.1 Ltd.