Huawei mate20 has two cards, one for Unicom and one for Mobile. If you change Unicom, you can only change Unicom by disabling mobile. How to change to Unicom?

20 19 1 1.27 officially opened the import/export business. During this period, you can go to China Unicom's own business hall and authorized cooperative business hall. If you need to transfer the port number to Unicom, you can send a short message to check whether it meets the requirements of port number transfer (edit "CXXZ# name # ID number" and send it to 10086 (mobile)/100/(telecom)). After receiving the port number transfer, you can handle the port number transfer business in China Unicom's own business hall with the verification code. When applying for the number portability verification code, if the SMS prompts that there are business restrictions, you can contact the current operator to lift the restrictions and then apply for carrying the authorization code.

Warm reminder: the time limit for bringing out the authorization code is 1 hour. Please go to the business hall within the effective time. Welcome to transfer the number to China Unicom. Different cities have different rules for port number transfer. For details, please contact the local Unicom customer service. The specific handling matters shall be subject to the actual situation. Please forgive me for the inconvenience.