WhatsApp has started the roll out of their new calling feature which has been rumoured for long time. The calling feature is similar to Viber where in you can make free calls on either 3G or Wi-Fi connection. You can easily make calls to any contact on your WhatsApp. But as of now this feature is rolling out to all users and it will take some time to get to all.
But in the meantime you can activate this feature, just follow the guide below.
2. Once WhatsApp is updated, you need someone to call you to get this feature. It is something like an invite system. so in case your friend has already got this feature, you can simply request them to call you. Once they call you, you will get the calling feature.
3. You can now start calling anyone on your contact list once this is enabled.
If you have already got this feature, you can call other friends and they can get this feature too.