Maybe the mobile in particular is a bad example because you are right, I can restrict access to it. But It's happening with the site in other languages too.

Thanks for the answer.

Of what you suggested, I have canonicals and content language meta tag.

I haven't tried the yet. Maybe that helps.

I have sitemaps too.

The problem I see with geotargeting with WM is what I mentioned above. Portugal and Brazil share the same language: portuguese. But in webmaster tools I can't say pt.domain.com is intented for Brzil and Portugal. I need to pick only one.