Have you heard of the 'one-ring' cell phone scam?
This happened to me last night at midnight.
Thankfully, one ring wasn't enough to wake me up and I don't call back numbers I don't know. :)
In this case, the scammers let the phone ring once — just enough to cause a missed call message to pop up on victims' phones — and then hang up. Victims who call the number back are connected to a paid "adult entertainment service" located overseas.
Those unlucky callers are generally charged a $19.95 international call fee up front, plus $9 or more per minute for the unwanted "service." (In some cases the scammers charge only a few bucks to the victim's bill to avoid suspicion.)
The BBB said the scam calls usually come from outside the United States, including from numbers with area codes 268, 809, 876, 284 and 473.