Here's how it works. Scammers target people who post things for sale on sites like Craigslist or Facebook Marketplace.If the scammer enters the code on the signup page, and the personal number used qualifies, Google issues a Google Voice number to the scammer. Scammers exploit Google Voice, a free communication service, to carry out fraudulent activities without revealing their true identities. The scam where you tell them the verification code that gets sent to your number? To completely avoid a Google Voice verification scam, only do business in person with verified funds. Take your time while selling items online. To prevent unwanted access to your account, it's important you don't reply to any requests for your verification code. Here's how a Google Voice verification code scam typically works: A criminal downloads the Google Voice app and links it to a Gmail account. Once a password reset link is sent via email it requires receiving a text message for verification.