Search for nearby cell phone signals through specific devices, and send short messages to others by using other people's cell phone numbers.

A "pseudo base station" is a pseudo base station. It inquires the information of the mobile phone card within a certain radius around it through the SMS sender and other related equipment, and then pretends to be the official base station of the operator, and uses other people's mobile phone numbers to forcibly send fraudulent information to the user's mobile phone, causing the victim to be deceived. This behavior is called pseudo base station fraud.