With all Sim Only bundles you can call unlimited within The Netherlands.
If you’re in one of the EU countries and want to call or SMS to a Dutch number, you can do so at no extra cost with a national bundle. With an international bundle, you can call 44 countries from the Netherlands. You can also call other EU countries from the EU. For example, if you’re in Germany, you can also use the international bundle to call France or one of the other EU countries. You can also use your mobile internet data from your bundle without extra costs if you’re in one of the EU countries. A Fair Use Policy
applies to this.