The new laws are designed to create a single market for telecoms services across Europe and block what Brussels officials called “arbitrary profits” on international calls.
Ownership of spectrum is national. Thus the people who have leased this, in each different nation, need to get a cut of the revenues from a call that crosses a boundary.
Current fees might well be “too high”. Although it’s also true that for businesses at least there’s plenty of choice out there, with international mobile plans being made available at very reasonable prices.
My best guess, and it is a guess, is that the EU would like to prise that spectrum away from the national governments and make it a shared European resource. Or, more importantly, a direct source of funding for the EU.