The Jan/Feb 2018 AARP Bulletin has some good info on phone scams that I hadn’t heard of. These are sneakier. I’ll just quote the article directly here, since they laid it out so well
The neighborhood ploy Your area code and prefix are displayed, so the call appears to be from a neighbor or nearby business. “Fewer people are comfortable blocking local numbers, increasing scammers’ success rates,” notes Jonathan Nelson of Hiya. And the fake number makes it hard for law enforcement to track.
The “Hey, there’s a call from my own phone number” scam It’s hard to resist answering a call from your own number, which scammers can simulate. And they are able to get around any call blocking that you’ve set up.
The one-ring rip-off Criminals sometimes program auto-dialers to make repeated calls to you, each disconnecting after just one ring. They know this might spur you into calling back the displayed number to complain. There’s double trouble if you call area codes such as 268, 664, and 876. These are for Caribbean countries and other places that have high per-minute phone charges. One scam involves getting you to call one of those numbers, then getting you to hold through transfers that rack up your bill until a scammer gets on the line and starts a fraudulent pitch.
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SOOOOOO, be careful!