Upvote:6
There is no such a thing as "activated visa". Page of stamps doesn't matter. You were in the country - your visa was in use.
Upvote:9
That's wrong.
In Schengen, single-entry visa holders normally get their stamps on the visa, and multiple-entry visa holders on the facing page.
Regardless, what matters is your entries and exits, not where the stamps are placed. A single-entry visa is used up after one entry and one exit, while a multiple-entry visa is used up after it expires.