Deutsche Telekom is engaged in the telecommunications services and information technology sectors. Co. operates as an integrated telecommunications provider. It is organized into four operating segments: Germany, Europe, and the United States; and Systems Solutions, as well as Group Headquarters and Shared Services. Co. provides fixed-network lines, broadband lines and mobile communications. Co. also provides customized Information and Communication Technology (ICT) solutions for corporate customers under the T-Systems brand. The Group Headquarters and Shared Services segment comprises cross-segment management functions, real estate services, and mobility solutions, among others.

Hellenic Telecommunications Organization is a full-service telecommunications group. Co. provides local, long-distance and international fixed-line telecommunications services in Greece and Romania, and mobile telephony services through its Cosmote subsidiary in Greece, as well as in Albania, Bulgaria, the Former Yugoslav Republic of Macedonia and Romania. Co. also provides internet access services and Internet Protocol (IP) -based telecommunications applications, as well as information technology application development and hosting services using IP technologies. Also, Co. provides several other telecommunications services, including value-added services and public telephone services.

Orange provides consumers, businesses and other telecommunications operators with a wide range of services including fixed telephony and mobile telecommunications, data transmission, Internet and multimedia, and other services. Co.'s portfolio comprises business lines (fixed-line, mobile, Internet), focusing on all customer segments (small and medium-sized businesses, multinationals), and personal and professional services for home, office, travel, and mobile. Co. manages eight operating segments: France, Poland, Spain, Rest of the Europe, Africa and Middle East, Other non-controlling equity interests, Enterprise Communication Services, and International Carriers and Shared Services.

Vodafone Group provides mobile and fixed telecommunication services including: access charges, voice and video calls, messaging, interconnect fees, fixed and mobile broadband and related services such as providing televisual and music content, connection fees and equipment sales. Co. provides a range of consumer products and services including mobile, fixed voice, broadband and television, financial as well as other services to operators outside its footprint. Co. also provides a range of enterprise products and services including total communications such as mobile, fixed and a suite of converged communications services, internet of things, cloud and hosting and carrier services.