A good news for Whatsapp iOS users! The newest update of the Whatsapp on iOS now supports free voice call features where it allows real time voice transmission between different Whatsapp users for free. 
Previously available on Android, Whatsapp finally rolled out an update for iOS users on this free call feature. Besides, Whatsapp users on iOS can send multimedia content such as images and videos after taking image with the built in button. The contact can also be edited and changed in the contact list.
Update to latest Whatsapp on iOS here
