How do Beijing Unicom's 3G postpaid customers handle SMS packages?

Beijing Unicom 3G post-paid customers can send SMS "SQDX+ Package Stall" to 100 10 for SMS package. The application is successful and will take effect next month. It cannot be processed from 20: 00 to 24: 00 on the last day of each month. For example, you can send a short message SQDX20 to 100 10 before 20: 00 on March 3, which will take effect on April 1 0.