Want to join the Whatsapp Calling world worry not servers are accepting invites again all you need is latest version of Whatsapp application and a call from someone who has the feature activated already.
Here’s the link for latest Whatsapp App and after that you can message me on Whatsapp and I can call you to activate this feature.
My number is +919439105556. Sorry guys my phone fell in water and I cannot invite you for calling but this xda thread has many individual on first post helping to get calling feature please ask them for an invite. XDA Thread
For the starters who don’t know Whatsapp has rolled out Voice Calling feature as beta features and some lucky users have it activated. So you can also get the feature but you need latest version from Website of Whatsapp.
Act fast as invites will be working for few hours only.