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.

Orange Belgium is a telecommunications operator in Belgium. Co. provides a range of products and services to the residential and business markets, including mobile telephony, fixed telephony, fix data, Asymmetric Digital Subscriber Line. Co.'s Belgium segment is divided into two operating units: Mobile as well as Fix voice data. Co.'s Mobile operating unit provides mobile phone equipment and services to residential and corporate customers, while Co.'s Fix voice and data operating unit provides fix voice, data and internet services to residential and corporate customers.

Tele2 is engaged as a telecom operator. Co. provides mobile communication services, fixed broadband and telephony, data network services and content services. The mobile service comprises various types of subscriptions for residential and business customers as well as prepaid cards. Fixed broadband includes direct access, which is its own services based on access via copper cable and other forms of access, such as fibre networks, wireless broadband and metropolitan area networks. Fixed telephony includes resold products within fixed telephony. The product portfolio within resold fixed telephony consists of prefix telephony, pre-selection (dial the number without a prefix) and subscriptions.

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.

Telenet Group Holding is a holding company. Through its subsdiairies and its broadband network, Co. is engaged in the provision of cable television, including television services, broadband internet and telephony services to residential subscribers in Flanders and certain communes in Brussels as well as broadband internet, data and voice services in the business market throughout Belgium and parts of Luxembourg. In addition, Co. is engaged in the provision of mobile telephony services through a mobile virtual network operator partnership with Mobistar NV.