Nowadays, almost every mobile phone user has received such a frightening call: the mobile phone rings suddenly and then hangs up immediately. If you return the call, you may be connected to a recorded message, or the call may be disconnected, or you may hear a busy signal, or there may be no sound at all. However, your phone bill will be charged exorbitantly in an instant.
A folk song expresses people's helplessness and the madness of scammers: The telephone rings, and the scammer starts to trick you. It rings once and then disconnects, which is rare, and it is difficult to identify the strange number; when you call back, you realize something is wrong, your mobile phone has been charged exorbitantly, with amounts ranging from dozens to hundreds of yuan, and the scammers keep succeeding...
What kind of trap is this? How did this trap form? The reporter conducted an in-depth investigation into this matter.