Under his leadership Belgacom got listed on the Brussels stock exchange, and the company also launched digital IPTV services in Belgium.
In March 2003, Bellens was appointed Belgacom’s president and CEO as the successor to John J. Goossens.
In January 2014, Dominique Leroy was appointed as the new CEO of Belgacom, renamed as Proximus.
Didier’s time at Belgacom was not without controversy. His position as the head of Belgacom almost ended in 2011 after a strong dispute with the company board and the Belgian federal minister for Civil Service and Public Enterprises, Inge Vervotte.
In November 2013, he was dismissed following the sale of Belgacom buildings to a real estate company of which Bellens was a board member. Because of this conflict of interest, Bellens lost the confidence of the government.