User has to buy a package of dta that only lets them use the data in certain apps. There are "social packages" "video packages" and "email packages" for example.
More information (in pictures, easy to understand even if not in english): https://www.meo.pt/internet/internet-movel/telemovel/pacotes-com-telemovel
RespectMyNet.eu is an online platform enabling citizens to report net neutrality violations. Everyone is invited to report blocking or throttling of their Internet access or unfair discrimination between online services. This will help to shed light on those harmful practices and provide evidence to the telecom regulators to do their duty to defend the open and innovative Internet in Europe.