Phone and internet scams (电信诈骗) are a major problem in China. Common scams include impersonating police, fake lottery wins, and romance scams. The phrase 防骗 (fáng piàn, fraud prevention) appears everywhere.
usage
子 is a common suffix that turns a verb/adjective into a person: 骗子 (cheater), 疯子 (madman), 傻子 (fool), 胖子 (fat person).