Another phone scam

Evilly cunning phone scam from Japan http://www.economist.com/business/displayStory.cfm?story_id=1367988. “Dubbed wan giri, or “one-ring hang-ups”, the scheme targets millions of mobile-phone lovers. Unscrupulous operators make thousands of random calls from normal phone lines, letting the phones ring once before hanging up. They count on inquisitive folk, or those anxious not to miss a single call, ringing back the number shown on their screens. Those who do find themselves listening to advertisements for all sorts of dodgy services.”