This is not about you travelling to another country and using your phone. This is about you using your phone to call a number in another EU country. The EU is now trying to close that gap so that calling somebody in France from Spain costs the same as calling somebody in Spain.
Was this written a decade ago? I’m fairly sure a standard phone plan in any EU country works identically elsewhere in the EU.
Until a certain point. From what I remember there was a minimum allowance and then a standardised rate applies. I could be wrong tho.
This is not about you travelling to another country and using your phone. This is about you using your phone to call a number in another EU country. The EU is now trying to close that gap so that calling somebody in France from Spain costs the same as calling somebody in Spain.