WhatsApp comes with a useful built-in feature to help users reduce their data consumption during calls. If you'd like to take advantage of this new feature, you'll need to enable it first in the app settings.
How To Lower WhatsApp Mobile Data Usage
, tap on the More
menu > Settings
. Tap on Chats and Calls
Scroll to Call Settings
and tick the Low Data usage - Lower the amount of data used during a WhatsApp call
Data consumption will be reduced, but it should be noted that you are bound to experience minor loss in call quality as long when this feature is enabled.