First recognized by Better Business Bureaus (BBB) on the East Coast, the “One Ring” phone scam is now being reported across the United States.

As an industry leader in identifying and tracking emerging scam trends, the BBB serving Alaska, Oregon and Western Washington is alerting the public to this simple—yet extremely effective—ploy that can result in unauthorized charges on wireless statements.

Automated dialers blast thousands of random calls to mobile numbers that are gleaned from public listings or obtained from black market dealers—who hustle “sucker lists”—but disconnect after one ring, according to a BBB media release. The scammers count on call recipients to notice the missed calls in call logs and return them out of curiosity.

However, return calls are often directed to expensive international hotlines—sometimes peddling “adult entertainment”—that can charge upwards of $19.95 to connect plus additional costs per minute. Charges typically appear on month-end statements as “premium services.”

Consumers and businesses report calls from several different area codes:

• Dominican Republic—809

• Jamaica—876

• British Virgin Islands—284

• Grenada—473

The illegal process of sneaking unapproved charges onto phone bills is referred to as “cramming” by the Federal Trade Commission, and is one of the most common consumer complaints in America.

While it is unlikely that recipients will be billed for accepting incoming calls, wireless carriers assume that users accept charges by voluntarily returning calls. BBB reminds consumers to not be dumb with smartphones:

• Never return calls to unfamiliar foreign numbers.

• Regularly check wireless statements and immediately report discrepancies.

• Add phone numbers to the National Do Not Call Registry and report violations.

For more information on the latest scams, visit BBB’s Scam Source.