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.

Intracom Holdings is a technology company engaged in activities in Greece. Co. is engaged in both domestic and international business ventures. Co. developes products, provides services and undertakes integrated advanced technology projects in four economic sectors: Telecommunications, Defense, Public Administration and Banking and Finance. Co.'s activities also include the design, production and marketing of terminal equipment (cash registers, Lotto terminals, info-kiosks, electric energy meters, etc.). Co. is engaged in the design of integrated telecom projects, the development of IT systems and networks, the production of telecommunication equipment and the provision of services.

Swisscom is engaged in providing telecommunication services and is active in Switzerland and Italy. Co. has three operating divisions: Swisscom Switzerland, Fastweb; and Other Operating Segments. Co.'s Swisscom Switzerland divisions comprised of: Residential Customers; Small and Medium-Sized Enterprises; Enterprise Customers; Wholesale; and IT, Network & Innovation. Co.'s Fastweb segment supplies its fixed-network both directly via its own fiber-optic network and also via the unbundled fixed-access lines and wholesale products. Co.'s other operating segments provides ICT solutions for physicians, hospitals and insurers, develops and operates intelligent solutions for energy management.

Telefonica is engaged in the provision of public or private telecommunications services, including ancillary or complementary telecommunications services or related services. Co.'s fixed business includes: traditional fixed telecommunication services, Internet and broadband multimedia services, data and business-aplications services, and wholesale services for telecommunication operators. Co. also provides a range of mobile and related services and products to consumer and business customers, including mobile voice services, value added services, mobile data and Internet services, wholesale services, corporate services, roaming, fixed wireless, and, trunking and paging.

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.