CITIC Telecom International Holdings Limited, an investment holding company, provides telecommunications services worldwide. The company provides carrier services, such as mobile roaming signaling SCCP, single IMSI multiple number, pre-paid roaming, MVNE, GMVNO, USSD, IP packet exchange, and short message service (SMS) firewall; Internet services; and international voice services, including voice hubbing service in handling roaming service for mobile and fixed line operators and data roaming services for mobile operators; SMS services; datamall; big data; and Internet of Things services. It also offers enterprise solutions, including network connectivity, data center, cloud computing, information security, enterprise mobile services, and voice and information services; and Internet-based communication services, such as Communication Platform as a Service for handset manufacturers and OTT operators. In addition, the company builds the infrastructure and applications of Digital Macau; and provides communications services for local airports, entertainment facilities, and events, such as the Macau Grand Prix, as well as offers local and roaming communications services to individual customers. Further, it offers mobile services, which includes local 4G, roaming, greater bay, and OTT TV services; local and international fixed line telephone; sales of handsets; and WIFI hotspots and home broadband services. The company was formerly known as CITIC 1616 Holdings Limited and changed its name to CITIC Telecom International Holdings Limited in 2010. CITIC Telecom International Holdings Limited was incorporated in 1997 and is headquartered in Kwai Chung, Hong Kong. CITIC Telecom International Holdings Limited operates as a subsidiary of CITIC Limited.