STEPS
STEP 1: Download the latest
whatsapp 2.11.561 or above. DOWNLOAD FROM HERE .
This is link of official google drive website not any scam so its safe to DOWNLOAD IT FROM HERE.
STEP 2: Backup your conversations if you want to and install the latest update on your smartphone
STEP 3: After installation just send
whatsapp message " Call Me AD" “”
and you will receive a call on whatsapp soon which will enable your calling feature .
Make sure you have a working internet connection otherwise you will not be able to receive the call .
Thank You n Enjoy ;)