KDDI is a telecommunications company. Along with its affiliates, Co. operates in four principal business segments: personal, value, business, and global. Co. is engaged in the sale of mobile handset; and the provision of mobile telecommunication services under "au" brand name, Internet contents, settlement service, and electronic money service for individual customers. Co. offers information and communication technology ("ICT") solution services and data center services for domestic corporate customers, overseas companies and individual customers. Co. is also involved in the call center business, the research and technological development, and the telecommunication facilities maintenance.

LG Uplus is engaged in the business of mobile telephone, communication, voice and data services. Co. provides the following services: cellular services; paging services, which provides paging via satellite, high speed paging, and interactive data transmission; IMT-2000 Services, which is wireless multimedia service accessible through a network based on wide band CDMA technology; and home solution services, which provides local, long-distance and overseas telephone services, broadband Internet services, and cable television transmission network services.

NTT Data is an information technology ("IT") company mainly engaged in the provision of system integration and network system services. Along with its affiliates, Co. operates in five business segments: public & social infrastructure, financial, enterprise & solutions, North America, and EMEA & LATAM. Co. provides IT services including system integration, network information, consulting, business solution, and system support services to its customers in various industries both domestic and overseas. Co.'s principal products and services are "Accel-Mart," "Aggregate Master®," "Tableau™," "IMDA®," "IsleLinX®," "BRIMOS®," "RemoteOne®," "WinActor," "ANSER," and "AnserDATAPORT®."

SK Telecom is a wireless telecommunications services provider in the Republic of Korea (South Korea). Co. provides the following services: wireless Internet services, which include music portal services, game portal services, multimedia services, and wired and wireless integrated multimedia services; ubiquitous and convergence services, which include telematics, digital home, commerce, mobile radio frequency identification and mobile community; international roaming services, which include global system for mobile communication; video telephony services, which enable subscribers incorporating video conferences, as well as B2B services.