WhatsApp has unofficially started rolling out its voice call feature.
The WhatsApp call feature has been in the pipeline for a while now and it seems that the company is gearing to start offering the service to its 700 Million+ users.
The WhatsApp voice call feature requires the latest version of the App to work but its availability is enabled on a per-user basis.
This implies you will have to receive a WhatsApp voice call in order to activate it.
Some have however, found a way to enable the feature on their rooted Smartphones, but they still need to receive a WhatsApp voice call in order to activate the feature.
WhatsApp is expected to roll out the voice call feature in waves.
This is probably in order to meet the massive data center capacity required to handle calls from its massive user base.