SMSFAST is built around a simple idea: a verification code without a real number attached. Pick the service that needs verifying, Google, WhatsApp, Telegram, whatever the case is, choose a country, and buy a number. Enter that number on the sign-up form in question, and the code appears in the SMSFAST dashboard, usually within a few seconds. Regular users keeping a real number private on sign-ups and dodging spam. VerdictAs a temporary number service, SMSFAST ranks among the more capable options around.