But the numbers use a country code for regions like Lithuania, Mauritania, or Morocco. The calls are trying to get the receivers to call the number back, which often then results in toll charges similar to calling a 900 number. Reports of calls have come in from New York State and Arizona.
Oklahoma Attorney General Mike Hunter says the phone calls have been targeting Oklahomans with Tulsa area codes.
"Consumers should not call these numbers back", it said. The robocall only rings once or twice, hoping the receiver calls back.
You've probably familiar with those obnoxious robocalls, and maybe you've gotten "neighbor spoofing" calls.
Sand Springs are warning residents who have recently received phone calls that appear to be from Sierra Leone, or another country, to not answer.
"If you call any such number, you risk being connected to a phone number outside the US", the commission said.
The scam is pervasive across the globe - its name, Wangiri, is Japanese for "one cut".
If you're billed for one of these calls, first try and resolve the issue with your phone company. "You can also call your phone provider to ask about other technology they may offer to help reduce these nuisance calls", police said. Another key tool is consumer education like this alert and the FCC's One Ring scam consumer guide.