Belgium Telecom (Belgacom) Belgium's largest telecommunications operator, originated in 1879, headquartered in Brussels, mainly owned by the government, its fixed-line communications business is operated by Belgacom; mobile communications business is operated by the Proximus trademark; for professional markets, ICT services are provided by Telindus trademark. Telindus operates the ICT services for the professional market. Belgium Telecom was ranked No. 905 in the Global 2000 in 2014.