London - Nimbuzz, a provider of VoIP and IM services for mobile devices and social networks, announced on Wednesday that it has raised a $15 million second round of funding, led by Naspers/MIH with participation from previous backer Mangrove Capital Partners.

London - Nimbuzz on Tuesday introduced its free mobile VoIP and instant messaging service, which enables free calls, instant messaging and group chat on over 500 supported handsets across services including Skype, Yahoo, AIM, Google Talk, MSN and 23 social networks including Facebook and MySpace. Available now as a beta in the U.K., the service works on Nokia Symbian Series 60 devices connected to a 3G or Wi-Fi network, and also offers a hybrid VoIP for GPRS/EDGE, allowing users to make international mobile calls at local dial-in cost.