evidence: In January 2023, four older adults in Florida each called back an unknown number from a missed call — and fell for an elaborate scam that cost them a total of $98,400 in cash. [...] - Do not call the number back. When you call back a spam number, you're playing directly into the scammer's hands. You could expose sensitive data on the call or make yourself a target for further scam attempts. [...] - Don’t call back a number if your phone rings once. Spam callers can hide international numbers with ID spoofing. These one-ring calls are bait — the fraud happens when you call back the spam number. If you must call back after a missed call, check the area code to ensure it's in the United States.