Unicom's contract plan generally has binding requirements on the package grade, so you can't change the package, which does not rule out that it is caused by participating in contract preferential activities. It is suggested that the following unsuccessful replacement can also be used for investigation:

1. Your mobile phone is in arrears and cannot be replaced;

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

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

4. The last day of the end of each month may affect the package reform business;

5. The original mobile phone package does not support switching to other packages;

6. The system is busy. If the website operation is currently heavily visited and the system is busy, you can try again later.

If you still can't solve your problem or the above situation through the above methods, I suggest you contact the customer service of your place of origin to understand; If there are conditions that do not meet the requirements, it is recommended that you cancel the restrictions before handling the package change business.

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