Hellenic Telecommunications Organization S.A., together with its subsidiaries, engages in the provision of telecommunications and related services to residential and businesses in Greece and Romania. It operates through Greece - Fixed Business; Greece - Mobile business; and TELEKOM ROMANIA MOBILE segments. The company offers fixed-line services, internet access services, national and international wholesale services, and TV services; mobile telecommunications services; and retail operations. It also provides fixed and mobile telephony broadband services; satellite telecommunication; financing services; technical support services; training services; and retailing and marketing services. In addition, the company is involved in real estate activities. The company was incorporated in 1949 and is based in Athens, Greece. Hellenic Telecommunications Organization S.A. operates as a subsidiary of Deutsche Telekom AG.