WhatsApp is working on a new feature called Flash Calls in the WhatsApp beta for Android 18.104.22.168 update.
Using this automatic verification method, WhatsApp will call your phone number and then automatically end the call, verifying the last phone number in your phone’s log is equal to the number that gives you the 6-digit code. This phone number is always different, so there is no way to trick this method, ensuring a safe experience.
WhatsApp is now working on an introduction for the feature to explain why it needs the permission to make and manage calls and access to your phone’s log:
This feature is under development and it will be available in a future update on WhatsApp for Android.