As we all know that whatsapp new version for lollipop gets
voice calling feature her i will tell you how to get voice call
feature in whatsapp voice call.this is step by step tutorial for getting
1.Download latest version of whatsapp from whatsapp official site.
2.You need latest version of whatsapp.apk for voicecall activation.
3.A rooted mobile.
4.Terminal Emulator apk
Activating Whatsapp Calls.apk
1. Install Terminal and open and type the following code
Type : su after typing you will gaining superuser permissions.
Then type below code:
am start -n com.whatsapp/com.whatsapp.HomeActivity
DONE! But calls might not work