WhatsApp for android beta version 2.16.189 added two new features for its
users.The voice mail and call back option.You can now send a voicemail
directly when a user fails to attend a whatsApp call,instead of going back to
the chat window to send your voice message.The call back option only lets
the user call the person again if he/she did not respond at first.For now
these new features are only avialable on WhatsApps android app,sorry
iOS users.Though it isn’t yet available on google play store, but they are
available in the app’s latest beta version.
