The reasons for the failure of changing mobile phones to 3G packages are as follows:

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

2. The package has been changed in the current month;

3. Your mobile phone is in an abnormal service state, such as stopping the number, reporting the loss, or blacklisting users;

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. The package cannot be changed from 00: 00 to 24: 00 on the last day of the month;

6.2G prepaid users cannot handle 3G services in the online business hall;

7. The original mobile phone package does not support changing to 3G package. For example, if you participate in Unicom's contract plan, you can only switch from flat package to high package during the contract period, but you can't successfully switch to low package.