Sonera (formerly Tele/Telecom Finland) is a Finnish telecommunications juggernaut, conquering Europe and the rest of the world shall follow.

They're famous for being a telephone operator (for both landlines and mobile networks) and an ISP.

Sonera is currently the Finland's leading GSM service provider.

Sonera's daughter companies run Sonera Plaza (a Finnish web portal with a rather nice search engine that finds mostly everything from Finnish pages) and Sonera Zed (SMS service provider), and they also have several less "visible" daughter companies (such as Sonera Living that cooperates with builder companies to make homes with broadband net connections and Sonera Carrier Networks that maintains the carrier network.)