The two-factor authentication feature them in the latest beta version of WhatsApp app (2.16.341 and above). According to Android Police, the function has also been spotted on the Windows Phone beta. This two-factor authentication function prompts the user for a static six-digit password every time you register a new phone to the existing account. This feature is useful because it can provide defense against criminals who might try to clone your phone. Earlier SMS confirmation was the only way to register the existing WhatsApp account new device and SMS can register all devices are sent to your phone.
Therefore, two-factor authentication provides a critical line of defense against criminals. To enable two-factor authentication, users need to sign up for a beta version of the Google Play Store.
Open WhatsApp page in the Google Play Store and keep scrolling down and you will tap an option "Logging in the tester" to "I am" and wait to find a few minutes.
Step 1.After with a beta app, go to your account settings in WhatsApp
Step 2.Now Click "Two-Step verification" and tap "Enable"
Step 3.Now you need to enter a six-digit password which will be asked when you register to enter your phone number in WhatsApp
4.Next step, you need to add an email address to your account that can be used to reset your password in case if you forget
That is it! Now two steps is enabled. Now you need to enter the password every time you sign in WhatsApp on a new device