In more Scandinavian VOIP news, Vopium from Denmark has released the first Blackberry calling app that allows users to make cheap phone calls phone calls over Wi-Fi or their existing network coverage. While Skype is clearly the market leader in VOIP technology, other players like Rebtel and Vopium have sprung up claiming cheaper calling rates and better integrated experiences.

Vopium is the first VoIP service provider to offer a Wi-Fi calling app through BlackBerry App World. Rebtel offers a similar service, but with it you need to use your monthly minutes, which can be a costly while travelling. And logically, the Vopium app offers least-cost routing to both mobile and landline numbers whenever you’re connected to Wi-Fi.

The Vopium app apparently makes it easy for users to know if they are connected to and placing calls via Wi-Fi. Vopium designed the app to minimize battery consumption, so users can make frequent Wi-Fi calls and still have battery life that lasts at least a full day. This makes Wi-Fi calling a viable replacement for office desk phones and home phones.

Vopium claims more than 1 million users in 52 countries and is listed on the NYSE Euronext Paris Exchange. The app is available now in beta version for BlackBerry smartphones running OS 6 or later. The app is available directly from Vopium and from BlackBerry App World.