In this week's scam, cybercriminals are using phone calls to try to scam you. This type of scam is also known as vishing. You receive a strange call on WhatsApp, a calling and messaging app. The call is from an unknown number, and when you answer, you hear a robotic voice that asks you to add a phone number to your WhatsApp contacts. The call then quickly ends without any further explanation. It seems unusual, but harmless.