Finally after a period of staggered activations on certain days the voice calls via WhatsApp seem to be active for everyone who has ANDROID. Finally the service seems to have come out of the beta phase, by installing the latest version of the program available, you should be able to see the automatic activation of calls without waiting for a phone call from those who already have the service active.
To download the latest version for your mobile you will need to reach the address http://www.whatsapp.com/android/ download and install the APK on your device.
Calls should now be active.
