This was quick. Only two months after KPN announced it will surcharge the use of certain data application competing with its voice, SMS and video services (here) it became illegal to do so.
Brian O'Brien reports to the New York Times: "The Netherlands on Wednesday became the first country in Europe, and only the second in the world, to enshrine the concept of network neutrality into national law by banning its mobile telephone operators from blocking or charging consumers extra for using Internet-based communications services like Skype or WhatsApp, a free text service.
The measure, which was adopted with a broad majority in the lower house of the Dutch Parliament, the Tweede Kamer, will prevent KPN, the Dutch telecommunications market leader, and the Dutch units of Vodafone and T-Mobile, from blocking or charging for Internet services. Its sponsors said that the measure would pass a pro-forma review in the Dutch Senate without hitches".
See "Dutch Lawmakers Adopt Net Neutrality Law" - here.