WhatsApp is working to introduced voice calling feature on iOS soon. I have installed WhatsApp beta from below site https://dev2.whatsapp.net/ios/WhatsApp/ I have to resign the beta app using iModsign and install on iPhone using iTunes. I am now able to receive voice calls on WhatsApp beta but I am not able to make outgoing voice calls. Has anyone tried installing WhatsApp beta on iOS and is outgoing voice call working for you? PS: iPhone is NOT jailbroken.