Wikipedia
Vopium
Vopium is a software-based provider of free and low-cost international mobile communication via VoIP and Wi-Fi technology, based on a free but closed source client application.
In February 2010, Vopium's VoIP and messaging solution was launched as a white label and in March 2010 Vopium partnered with Convergia Networks Inc. Vopium currently enable several white label partners, aomong others Ooredoo Tunesia ("Link"), Telenor ("Comoyo"), TalkTalk ("Talk2Go" and Mobilink ("Mobilink Word")
In June 2010 Vopium has expanded its group of owners to include the international telecommunications investor Raghuvinder Kataria who invested $16.5M.