Common junk messages include advertisements, swindles, information on illegal selling of vehicles, weapons or fake diplomas, and short message services( SMS) that users never signed up for.

• 垃圾短信的主要内容包括商品广告，欺诈类短信，倒卖黑车、支的短信、办各类证件的短信及用户未订阅的短信服务等。