To unbind the mobile number bound to Amazon, first log in to your Amazon account, enter the account settings, find relevant options such as "Phone Number" or "Bind Mobile Number", click Unbind and follow the prompts.

If you encounter difficulties, you can contact Amazon customer service for help, provide relevant authentication information to ensure the security of your account and follow the steps.

Once the binding is successfully unbound, you can choose to bind a new mobile number or remain without a mobile phone. Remember to protect your personal information and ensure the security of your account.