Don't know the number calling you? Then don't return the call.
That's the warning from the Better Business Bureau.
The BBB says this is a new type of cramming scam that is targeting people across the country. They call it the "One-Ring" scam. The scammers behind it don't care about the Do Not Call list, so being on that list won't help you.
"It is a new take on an old scam, so we are familiar with this type of thing, but the one-ring scam is brand new," Better Business Bureau Spokesman Aaron Reese said.
Returning the call could mean upward of a $20 charge for international calling, or even monthly charges on your phone bill.