Sent me an sms with the secret code to register my whatsapp on another device. Then they sent me a whatsapp appearing to be from one of my friends, asking me to send her the code. Seems they may have pulled that one on her already, now her account is compromised and they can try it on all her contacts. Fortunately the msg I got was in terrible grammar, so I knew it wasn't from her. Don't disclose these codes to anyone, even your friends..... They would have no good reason to ask you for this.