1. Photo query of the front and back of the ID card: Take photos of the front and back of the ID card through the camera function of the mobile phone, and then scan it with the ID card scanning software to quickly obtain the ID card number.
2. Mobile banking inquiry: Users who have handled mobile banking can log in to mobile banking and inquire their ID number in the functions of "Card Management" or "Account Information".
3. Alipay inquiry: On the "My" page of Alipay, select "Personal Information"-"ID Information" to check your ID number.
4. Wechat query: Go to Wechat's "Me"-"Settings"-"Personal Information"-"My Card" to view the bound ID information.
It should be noted that in order to protect personal privacy, some applications may not support directly querying the ID number. It is recommended to use regular applications for inquiry as much as possible to avoid revealing personal information. If you can't find your ID number, you can consult the relevant authorities or institutions to get more accurate information.