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It is currently in the WhatsApp beta for the Android 2.21.11.7 update.
This feature allows users to quickly get verified while logging into WhatsApp via an automatic verification over a call.
WhatsApp will call your phone number using this automatic verification method, and then automatically end the call. It will then verify the last phone number in your phone’s log is equal to the number that gives you the 6-digit code.
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WhatsApp will need your permission to make and manage calls and access to your phone’s log during this process. The call history won’t be used by WhatsApp for other purposes.
iOS smartphone users won’t be getting the feature as Apple doesn’t offer any public API to read the call history. The report further states that this feature is optional and users will still be able to verify themselves using the existing methods.