Get WhatsApp calling feature without root and download apk

WhatsApp calling feature is trending these days and everyone is trying to get it. But as I posted in my previous posts, to get whatsapp calling feature you have to root your phone and do some coding work on terminal emulator to enable whatsapp call feature. But that trick was very limited because if you close the terminal emulator, the calling feature gets lost.
So, I am back with a new trick