WhatsApp voice calling is set to launch in the first quarter of 2015, and South African network operators are ready to support the service. WhatsApp’s voice calling will be a mobile-only service, competing against the likes of WeChat, Viber, and Skype, and was originally set to launch in Q2 2014. WhatsApp CEO Jan Koum explained that the delay was due to several technical issues with the service which needed to be worked through. Source: MyBroadBand