How to activate less data for calls on WhatsApp

How to activate less data for calls on Whatsapp:

Step 1: Open WhatsApp on your Android or Apple smartphone. 

Step 2: Tap on the Settings button at the bottom right corner of the app. 

Step 3: Now tap on the Data and Storage option. 

Step 4: Now, toggle the 'Use Less Data for Calls' option' button and you are good to go!