Recently, Shanghai residents have reported that on some social media platforms, some people use personal privacy information of citizens to engage in illegal business: they only need to provide a mobile phone number, and detailed information related to express delivery, takeout, etc. can be found. The media reporter contacted a person who provided the service and conducted two experiments, both of which yielded relevant information. Media reporters found that after providing a mobile phone number to the other party and entrusting them with payment for investigation, a few hours later, they received photos and detailed logistics information of previous express orders, and the relevant information was accurate and accurate. By making a payment, the delivery record of a certain delivery platform with another specified phone number can be obtained. All order addresses, prices, and order numbers can be matched one by one, and even the user's notes to the merchant can be seen at a glance. It can be seen that the situation reported by the citizens is true. This phenomenon is surprising. Generally speaking, only couriers and delivery personnel responsible for delivering relevant orders can see consumer personal information. The staff of a certain express logistics network also affirmed that "unrelated outsiders cannot know your personal information.". However, media reporters can easily access the personal privacy of citizens through payment and mobile phone numbers. This is extremely alarming upon careful consideration. Once citizens' personal privacy is leaked and sold through this channel, the consequences would be unimaginable. What methods do personnel providing such query services use to obtain personal privacy related to citizens? A few years ago, there was an advertisement online that said, "By entering the phone number of a family member or friend, you can easily locate them with just one click. Not only can you update their location in real-time, but you can also check their trajectory." If this advertisement is true, it indicates that someone can use location technology to check their personal privacy. Nowadays, multiple personal privacy information of citizens can be accessed through a single phone number. What are the methods and channels used to achieve this? Experts analyze that the protection level and requirements of relevant enterprise databases are relatively high. In addition to external attacks and internal personnel stealing, external interfaces often become a link of data leakage. That is to say, a mobile phone number can be used to check the personal privacy of citizens, but there are only three ways to leak information, but the specific one remains to be confirmed through investigation. The relevant parties should use media reports as clues to quickly identify the above-mentioned personal privacy protection loopholes. Based on the current situation, at least three types of warnings are brought to us: firstly, there are still loopholes in the protection of user personal information by relevant industry enterprises, which may lead to the "harvesting" of various citizen privacy through a single phone number. Secondly, it is urgent to establish a sound mechanism for the destruction of user personal information stored by relevant industry enterprises. Citizens should promptly destroy their personal information after use in order to reduce the possibility of leakage. Thirdly, there is an urgent need to improve the governance of illegal activities that infringe on the personal information of citizens. In recent years, China has improved its legal system, such as strengthening personal information protection in the Civil Code, specifically formulating the Personal Information Protection Law, and carrying out special actions such as cracking down on infringement of citizens' personal information, which have effectively deterred criminals. But it should be noted that driven by economic interests, some people still illegally profit by infringing on the personal information rights of citizens. Providing personal privacy inquiry services through mobile phone numbers is an example. Through illegal means