WhatsApp iPhone app gets new voice calling feature
The changelog notes that the new WhatsApp version will slowly roll out over the next several weeks, meaning that it may take some time before the update reaches your device. If you're impatient to get the new feature before the update reaches you, here's a way to enable WhatsApp voice calling on your iPhone, but please note that you'll have to install a beta version of the app manually.
After landing on both iOS and Android, the new feature is now planned to be ported to the third mobile platform by market share, Windows Phone. Rumors dating back to April 2014 argued that WhatsApps's voice calls will also reach the BlackBerry OS, but so far, we have yet to hear of any concrete plans.