2. Social accounts: On some social platforms, users can search other people's accounts through their mobile phone numbers.
3. Online shopping information: On the e-commerce platform, the mobile phone number search function has been opened, and others can find the user name through the mobile phone number.
4. Travel records: The user's travel location can be found through the mobile phone number, such as hotel check-in records and flight information.
5. Registration information: Many websites and applications need mobile phone numbers to register, and through these registration information, we can know the activity of users on other platforms.
6. Personal information database: There are some so-called "social worker databases", which contain a lot of personal information, including name, mobile phone number, ID number and so on.
7. Location information: The user's location can be roughly located through the mobile phone number, especially in some emergency situations.