Dear, hello, people who use the secondary card can't find the ID information of the main card, and their privacy will not be revealed casually. On the day of real-name authentication of mobile phone card, many people will open a secondary card for others to use, but the user of the secondary card can't find the information of the main cardholder; In the business hall system, the information of the real-name authenticator is confidential, and the secondary card user can't find the information of the main card holder ~ Of course, if you want to verify the user's information, you can know through the background, and you can determine whether this person is real-name authenticated by reporting his name+ID number. On the other hand, if you want to check your ID number, you can't. Your privacy is protected.