Proximus supplies integrated telecommunications services on the Belgian market. Co.'s activities are divided into four segments: Consumer Business Unit (CBU), which sells voice products and services, internet and television, on fixed and mobile networks, to residential customers; Enterprise Business Unit (EBU), which caters to professional customers; Service Delivery Engine and Wholesale, which centralizes all the network and IT services and costs, provides services to CBU and EBU and sells these services to other telecom and cable operators; and International Carrier Services, which focuses on international carrier activities.

Koninklijke KPN is an integrated information and communications technology service provider. Co. provides its consumer customers data broadband services, IPTV services, mobile (voice, data and SMS) and fixed line telephony. Co. provides its business customers broadband services, mobile, fixed line and data services. Co. operates in the following segments: Consumer Mobile, which provides mobile services and products; Consumer Residential, which provides services in and around the house; Business, which provides fixed and mobile telephony services; NetCo, which includes fixed wholesale services; Belgium, which provides mobile telephony; and iBasis, which provides wholesale network services.

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.