WhatsApp uses six-digit codes to verify phone numbers during setup. If you didn't request a code, it means another user entered your phone number into their app. Whether it was a typo or a deliberate hack, the 211431 code is the "key" to your account. 2. The Dangers of "Free WhatsApp" Offers
: Never download WhatsApp from a website or a link sent in a message. Use the Google Play Store or Apple App Store .