How can I reserve my mobile phone number online without a social security card?

1. First log in to Social Security official website, enter the account number and password, and enter the personal account page.

2. Then find the option of "password confidential modification" in the page, click Enter, and fill in the new mobile phone number.

3. After confirming the input, click "Send Verification Code" and fill in after receiving the verification code.

4. After the mobile phone number binding is completed, click "Mobile phone binding" to bind a new mobile phone number.