WhatsApp voice calling now available to all Android users, no invite necessary

The latest version of the WhatsApp Messenger app now available for downoad on Google Play includes the much discussed WhatsApp Calling ...

The latest version of the WhatsApp Messenger app now available for downoad on Google Play includes the much discussed WhatsApp Calling feature activated by default. Users no longer will need to receive a WhatsApp call from a friend to have the feature activated. Describing what's new in the app, WhatsApp's Google Play page says, "WhatsApp Calling: Call your friends and family using WhatsApp for free, even if they're in another country. WhatsApp calls use your phone's Internet connection rather than your cellular plan's voice minutes. Data charges may apply"
Until now, the feature was invite-only and saw a limited rollout. Although there have been reports that the feature is working with the previous version of the app, it is suggested that you update the app to get the call tab.

It is worth mentioning that once you are on a call through the app, network calls will not work. You will be required to move to your phone's regular calling feature to place calls over the cellular network.
The feature is currently only limited to Android users and some Blackberry Devices. However, co-founder Brian Acton recently announced at the Facebook f8 conference that the voice-calling feature will be rolled out to iOS devices in a couple of weeks.