Why can't a nostalgic account of Journey be bound to a mobile phone?

Journey official website's account management is introduced. Log in to your passport, follow the instructions on the webpage, and click on your account management-mobile account binding-SMS verification code that requires mobile phone to send messages (edit SMS 130 10 1, and mobile users will send it to 53660(0.2 yuan/message). Unicom users please edit the short message 0 1065438. After sending successfully, you will receive a short message (verification code). Enter the required digital content in the information box, and finally set the binding.