whatsApp rolls out voice calling feature to voice call other.India has reported to get an update regarding      
the voice calling feature.
In India people with android lollipop 5.0x on nexus will be able to recieve upadates for others it has not yet known.
whatsApp is yet to announce voice calling feature oficially as it seems to know the feedback from the users.Jan Coum,co founder and chief executive of whatsApp says that the feature will be avalabile during the summer at Mobile World Congress last year.
Around 30 billion whatsApp messages has been sent everyday compared to 20 billion sms .