At the first Google search (irony) I found that apple is maybe around 30% maybe (depending on the source) a bit hight than Samsung which is pretty close. but when looking at iOS vs Android then we have 30% (iOS) vs 60% (Android).

this does not look at all even close to a monopoly from Apple.

As far as I see their power in Europe comes from the fact that competition is following them in some decisions.