Here’s how it works: Scammers are using auto-dialers to call cell phone numbers across the country. Scammers let the phone ring once — just enough for a missed call message to pop up.

The scammers hope you’ll call back, either because you believe a legitimate call was cut off, or you will be curious about who called. If you do, chances are you’ll hear something like, “Hello. You’ve reached the operator, please hold.” All the while, you’re getting slammed with some hefty charges — a per-minute charge on top of an international rate. The calls are from phone numbers with three-digit area codes that look like they’re from inside the U.S., but actually are associated with international phone numbers — often in the Caribbean. The area codes include: 268, 284, 473, 664, 649, 767, 809, 829, 849 and 876.