1. If you need to change your card, you usually need to bring your valid certificate to Unicom's own business hall.
2. However, some users may have bought it from an agent, or made it for their friends, or they were not registered in the real-name registration system at that time, so the owner's name may not be their own. With suggestions, you can contact the agent or agent you bought at that time to help you provide proof.
3. If you really can't contact the person in charge at that time, it is suggested that you need to bring your valid certificate and consult the staff of the local business hall for consultation. Some areas may provide detailed bills and 3-month bills, as well as valid certificates for mobile phone card holders and you. As there may be differences in local policies, please consult the staff of the local business hall for details.