evidence: A scammer leaves an urgent voicemail and a call-back number with an 809 area code. While it appears to be a three-digit U.S. area code, it's actually an international number. If you call, you'll be charged international rates while the person answering tries to keep you on the line as long as possible. Similar to the "One Ring" Scam. [...] Scam callers leave voicemails threatening legal action if you don't call back. Our guidance is: Never call back an unfamiliar number, because it may lead to a scam. [...] When your phone rings only once, late at night, you may be tempted to call back. But the call may be from a foreign country with an area code that looks deceptively like it's in the U.S. If you dial back, international calling fees may wind up on your bill. Such cons are known by the Japanese term "Wangiri."