According to the information you provided, if the package change is unsuccessful, certain conditions are not excluded. If changing the 4G package is unsuccessful, there are generally the following reasons:

1. Your mobile phone has expired and cannot be replaced;

2. You changed the package in the current month;

3. Your mobile phone is in an abnormal service state such as number protection and loss reporting, or it is a blacklisted user;

4. From the last day of the month to the beginning of the month, it may affect your use of the package for business;

5. Users with contract plan restrictions;

6. There are other restrictions that make it impossible to deal with;

If this is not the case, it is recommended to contact the Unicom customer service to which the number belongs.

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4G primary and secondary cards:/02 UPY;