Hanaro Telecom, Inc.: Telephone and broadband internet connection service provider, with web and mail hosting and internet roaming. [Korean, English]
Korea Telecom: Corporate profile and information about employment and services. [Korean, English, Chinese]
Korea Telephone Directory: Directory publishing firm, also a subsidiary of Korea Telecom. [Korean, English]
LG TeleCom: PCS service provider. Available services, investment information, and guide for foreigners. [Korean, English]
SK Telecom: Mobile phone service provider, also conducts research and development. [Korean, English, Chinese]