WhatsApp has taken further step by introducing a new feature voice calling after introducing WhatsApp Web for PC, which adds to the Material UI update it still retains under its belt. Suffice it to say improvements flourish with the latest update.
The feature allows WhatsApp users to call other users free of charge using GPRS, Wifi or 3G. As per the screenshots posted, the interface appears to be so simple. No major modifications have been made. They just added a tab, which upon clicking lets you “Add calls” or make some. Next to the call tab, there is another tab for chatting, which also shows the conversations you’ve been having with your contacts.
The voice call feature on WhatsApp has the invite system that avails it to other users. With this, one user can make a call to another user, who can in turn call another user, availing the feature to them as well. In other words, you get hooked to the system by being invited by another user, after which you can call any of your contacts to avail the feature to them, too. That’s it.
Enabling the WhatsApp Calling Feature
To enable the free calling feature, first make sure your Android device is running on either KitKat 4.4 or Lollipop. Once confirmed, you can update your Messenger into the latest version by tapping the update button (Here is the link to download latest version of whatsapp directly from official website ( http://www.whatsapp.com/android/ )
As of now WhatsApp call is Invite only. So you will have to ask someone who is already using the feature to call you to avail it to you.
Please note; WhatsApp calling is only available for KitKat and Lollipop users as per now. So in case your handset runs on anything below these two, you’d want to wait until WhatsApp releases an update that can be supported on other versions.
Note:
If you want Invite please follow these Links :
XDA