Hi Roberto Wikimedia wikis use the mobile frontend https://www.mediawiki.org/wiki/Extension:MobileFrontend by Wikimedia Foundation http://en.m.wikipedia.org (demo)
But I personally find it is limited in functionality, instead I would suggest the timeless skin https://www.mediawiki.org/wiki/Skin:Timeless by Isarra https://en.wikipedia.org/wiki/Main_Page?useskin=Timeless (demo) -- Svetlana
