Vopium is quietly company who provided the low-cost low cost IP-based international calling. Now Vopium is launching the mobile VOIP application for iPhone and now available for download from the Apple App Store.
Vopium on the other hand runs practically invisibly. Following a simple download, new users get 30 minutes of talk time and 30 international SMS messages for free. Vopium reroutes international calls to a Vopium gateway and then via global traffic carriers as ordinary voice traffic, seeking out the least expensive method available.