This warning about phone scams was found on the back of a taxi driver's headrest. It is not clear to me how these "It's me" scams were ever effective, but they have been mentioned in several dramas, even had a movie title devoted to them, and warnings have been posted by police departments in several prefectures. The particularly sad cases are where the victim admits later they never had any children in the first place, which should have been a perfect defense against such scams.