WhatsApp Calling lets you call your friends and family using WhatsApp for free, even if they’re in another country. Currently, WhatsApp Calling is available on Android, iPhone, Windows Phone and BlackBerry 10.WhatsApp Calling uses your phone’s Internet connection rather than your cellular plan’s voice minutes. Data charges may apply.Note: You can’t access 911 and other emergency service numbers through WhatsApp.urrently, WhatsApp Calling is available on Android, iPhone, Windows Phone and BlackBerry 10. WhatsApp Calling uses your phone’s Internet connection rather than your cellular plan’s voice minutes. Data charges may apply. Note: You can’t access 911 and other emergency service numbers through WhatsApp.