Which 30 countries?
I know that Teliasonera is used for Sweden, Finland, Denmark, Estonia, Latvia and Lithuania at least. And Telenor for Norway.
With 45 countries in Europe (+ 4 countries by association) that must mean that Telefonica has almost all the other countries. And definitely all the rest in western europe.
I would love to know those 30 countries and also if there are other countries where you know the carrier used.