Unicom sends SMS to change the package.

After the contract expires, contract users can bring valid ID cards to the local Unicom business hall to change packages, which can be changed into Unicom 3G basic packages for sale. If it is inconvenient to go to the business hall, you can contact the local Unicom manual customer service to see if you can change the package for you. In addition, it is recommended that you avoid the last day of the end of each month (the day cannot be processed) and the billing period at the beginning of each month when changing the package. The change of the monthly package will take effect next month.