From International Business Times article about Rebtel:
CEO Magnus Larsson and CMO Fredrik Wrahme, former executives at European telecom giant Tele2, want to change the mobile industry for good. "We're here because we believe that this market needs a revolution," Wrahme said.
The feature is the next step in the company's plan to grow its core business. Launching in 2006 in Sweden as a voice-over-IP firm, the company before now offered internet-based international calling through its app for a fee. Investors include Balderton Capital and Index Ventures. The company boasts an annual sales of $80 million, and its app is available for both iOS and Android.
Read the rest of the article at ibtimes.com