How to change the mobile phone card SMS monthly in M-Zone? Thank god, help me.

There are two kinds of music card packages and short message packages in the M-Zone: 1 and music card packages, including 19 yuan (130 free short message), 29 yuan (300 free short message), 39 yuan (500 free short message) and 59 yuan (1000 free short message). For example, you can send 19 yuan package: BLYY 19 to 186 1. If the application is successful, you will be reminded by SMS, which will take effect when the bill is settled next month. 2. SMS packages, including 10 yuan (130 free SMS), 20 yuan (300 free SMS), 30 yuan (500 free SMS) and 50 yuan (1000 free SMS). If you change it, you can send a text message to 186544 with the package fee plus SMSM and password. For example, to apply for the SMS package of 10 yuan, you can send it to:10ssmsm123456 ext 186 1. If the application is successful, you will be reminded by SMS, and the statement will take effect next month. The difference between the music card package and the SMS package is that the music card package can enjoy all local calls, color ring back tones and senior members of the wireless music club for free, while the SMS package does not have this discount.