How to change Unicom's 3g package through SMS?

At present, 3G users of Unicom can log on to the online business hall/homepage and click Self-service >; Doing business > parcel handling

& gt package change, select the package to change and confirm. The new package will take effect on June 1 of the following month. There is also a mobile phone business hall client or an original valid ID card to connect to its own business hall. At present, there are only the above methods to deal with it, and there is no way to open SMS for the time being. Need to remind you that there are only three times a month to change the package. After this month's package is modified, it cannot be modified again through the online business hall or the mobile phone business hall client, but only in the business hall. For example, if it has been modified through the Internet Hall this month, it cannot be modified through the Internet Hall or the mobile phone business hall, but only in the business hall. That is to say, except for the first modification in the online business hall or the mobile phone business hall, the second or third modification can only be made in the business hall.