Call 12306 to unbind the mobile phone number.

As far as I know, to call 12306 customer service phone to unbind the mobile phone number, you need to choose the option of "account binding" or "unbind the mobile phone number" according to the voice prompt, and provide personal information to verify your identity, then follow the instructions of the customer service staff. If you register through the client or official website, you can unbind directly on these platforms. If you have any questions, you can call 12306 customer service or go to the railway window or the sales point for consultation.