How do you revoke a banned number from whatsapp?

To revoke a banned number from WhatsApp, you need to first ensure that the number is no longer banned. If it's your number, you can try to recover your account by verifying it again through the app. If it’s someone else's number that you want to unblock, you'll need to wait for the ban period to expire or contact WhatsApp support for assistance. Keep in mind that if a number has been permanently banned for violating WhatsApp's policies, it cannot be unbanned.