How do Beijing Unicom 3G prepaid customers handle SMS packages?

Beijing Unicom 3G prepaid customers can send SMS "SQDX+ Package Stall" to 100 10 for SMS package. The application is successful and will take effect next month, in which it cannot be processed from the last day of each month 12 to 8: 00 the next day. For example, in March of 20 13, you can apply for the SMS package of 15 yuan. You can send short messages SQDX 15 to 100 10 before March 3, and it will take effect in April 1.