Today WhatsApp has started turning on two-step verification in its beta releases for both Android and Windows Phone. On Android, this feature is live in version 2.16.341 and above (maybe even earlier). On the Windows side, you'll see it if you're using WhatsApp 2.16.280 or newer. If you're using the betas for either operating system, you'll find the two-step verification option added to your account settings, as portrayed by the screenshot on the left in the image below. Once you tap on the new entry, you'll be taken to the Enable screen you can see in the right screenshot. You need...
Source: http://www.gsmarena.com/whatsapp_enables_twostep_verification_in_its_android_and_windows_betas-news-21571.php
