Did you receive a missed call from a number you don’t recognize? Human nature causes us to be curious about who wanted to speak with us, but beware: it may have been a scammer hoping you’ll dial back.Last week, across the 902 area code, many people received a phone call that appeared to emanate from Yemen. It appears that this is another wave of the ‘one-ring’ phone scam.How it works:In this scam, your phone will ring and hang up either just as you answer, or before you grab the call. If you’re curious enough to call the number back, you may hear music or audio-advertising. But while you wait, you may be unknowingly connected to a caller-paid toll service or chat line.Victims have reported being billed $19.95, even if they realized quickly and hung up right away. Others, who have stayed on the line longer, have reported being billed into the hundreds of dollars.Although last week’s calls appeared to be from Yemen, this scam in previous years has used area codes in the Dominican Republic, Jamaica, British Virgin Islands, Grenada, and Antigua. These calls are automated ‘robo-calls’, that because of number spoofing technology, may be coming from literally anywhere. This scam, which originated in Japan, is also known as Wangiri, which translates to "One (ring) and cut".How to protect yourself:Simply put, if you don’t recognize a number that called your phone, don’t call back. If it is important, someone will leave a message, or will call you back.Check your phone bills regularly and look for suspicious charges. And if you’re concerned, inquire with your phone service provider about restricting third-party billing.If you discover that you’ve been victimized in this scam, contact your local BBB, and help warn others by reporting it to BBB’s Scam Tracker.