A new update of WhatsApp would be practically ready to allow us to perform free calls via WhatsApp. This would free VOIP calls between users WhatsApp users, as is already the case for the voice call Facebook, Tango and other similar programs. Certainly the fact that WhatsApp is very common to find partners to help reach to make free calls via WhatsApp.
This news was announced last month by co-founder WhatsApp Jan Koum that in a statement made at the Mobile World Congress would have said "we're going to introduce voice on WhatsApp in the second quarter of this year." (Trad.. We will introduce the voice calls on WhatsApp in the second quarter of this year).
The site iPhoneItalia also presents a screenshot of a supposed beta version of the service for free calls from iPhone, which highlights the call screen with buttons for mute and turn on the speakerphone, and the user info with the button to make the call itself.
The calls can be made when you have an internet connection at a good level, both WiFi and 3 g/4 g.
This could be the answer to WhatsApp to cope with the loss of position in favor of Telegram the past few weeks.