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.

Tele Columbus AG. Tele Columbus AG is a Germany-based company engaged in the telecommunication and cable television business sector. The Company offers analog cable television (TV), digital TV, Internet access and cable telephony via broadband cable. The service offered by the Company includes digital cable channels, a telephone line or Internet flat rate. There is also a possibility to choose a double flat deal where the client combines a telephone and Internet flat rate or a Sky High Definition (HD). The offers are available in Berlin, Brandenburg, Saxony, Saxony-Anhalt, Thuringia , Saxony and in parts of North Rhine-Westphalia. The subsidiaries of the Company include Tele Columbus Netze Berlin GmbH, pepcom GmbH and Kabelfernsehen Muenchen Servicenter GmbH & Co KG, among others.

Telefonica Deutschland Holding is a telecommunication company. Co. offers its consumer retail and business customers postpaid and prepaid wireless communications products, along with wireless data services using Global Packet Radio Service, Universal Mobile Telecommunications System and Long Term Evolution technology as well as Digital Subscriber Line wireline telephony and high-speed internet services. Co. markets its products and its wireless and wireline communications products as well as services via the core brand O2. Co.'s secondary brands include the brands Fonic and netzclub. Co. also markets high-speed DSL internet access and wireline telephony.