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. You can't change the package from 00: 00 to 24: 00 on the last day of the month.
6. Other factors make it impossible to change the packaging.
Excluding the above situation, it still cannot be changed. I suggest you consult the Unicom manual customer service to which the number belongs.
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