It wasn’t long ago that Meta-owned messaging appWhatsAppfinally brought alongmulti-device access to a single account, though even now, it’s only still available to some of the millions of active users who would want to take advantage of this feature. Now, we’re hearing word that the app could flip the script and is working on multi-account access on a single device.
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With the help of a tester for the WhatsApp Business client for Android,WABetaInfois reporting that the version 2.23.13.5 beta features a hidden new interface that permits users to switch between accounts on the same device.
WABetaInfo claims there’s a lack of any clear language that would suggest this feature would remain exclusive to WhatsApp Business, which is a separate app to WhatsApp Messenger. That said, we should probably keep our fingers crossed. The account switching paradigm is still under development and, as such, is subject to change in nature. Down the line, however, the feature is expected to become visible in both WhatsApp Business and WhatsApp Messenger betas at some point before being refined and rolled out to the stable version.

If you’re interested in tinkering around with the app beta in question right now, you can sideload the APK fromAPK Mirror.
Also:WhatsApp Web and Desktop: How do you use them?
Some Android brands offer a feature that duplicates instances of an application on users' phones for the exact purpose of maintaining multiple accounts on a single device where an app may prohibit it - one such example is Samsung’s Dual Messenger feature. Ideally, though, it’s more efficient for the user in terms of local space and resources to have app publishers themselves handle account switching on their end.