How to reserve the mobile phone number for social security card? Can I leave it online?

The steps for booking the mobile phone number of social security card online are as follows:

1. First, open the local social security official website and enter your account number and password on the login page to log in.

2. Find the "password confidential modification" option on the website page, and click Enter.

3. Find the "new secure mobile phone" option in the menu bar and enter a new mobile phone number.

4. After confirming that the entered mobile phone number is correct, click the "Send Verification Code" button and wait for receiving the verification code message.

5. Find the verification code in the received verification code message and fill it in the corresponding input box.

6. After confirming that the verification code is entered correctly, click the "Mobile Phone Binding" button to bind the new mobile phone number.