I made a post on whatsapp calling features few days ago but
a lot of peeps seems to be confuse about it. Though the calling feature is
still in the beta stage meaning its not yet out to the public but you can
enable it.
Requirements
==>Root
access==> whatsapp latest version(version 2.11.508 )
==>terminal emulator
How Do I Enable The Calling Feature?
==> Make sure you have the right version of whatsapp
==>Open terminal emulator in your android phone
==>type in the following:
su
am start -n com.whatsapp/com.whatsapp.HomeActivity
==> Whatsapp should now open with the calling feature
enabled.
Drawbacks:
==>if you want to call someone, the
other person must have done the same thing (enabled this feature) in order for
that person to receive your call.
Source_Credit: Yomi-Proff