Starting this month, every type of subscription can be upgraded to have unlimited (i.e. no volume limits) internet access for an additional fee of only 10 EUR/month. Belgacom is doing this to counter the offer of Telenet; they have removed volume limitations to their higher subscription types (TurboNet and FiberNet).
About four months ago, both Belgacom and Telenet announced the ending of the volume limits in Belgium. This policy gained more and more resistance from various companies, claiming that the limitations were preventing from certain services to be expanded succesfully. Belgium was one of the last countries in Europe to have a volume barrier.