Now China Mobile's Fetion service seems to be short message charging. Why is this ~

Fetion by mobile phone … There is no charge for sending messages by Fetion on the computer or mobile phone, but it is charged according to the normal short message fee for directly replying to Fetion messages or short messages sent by others. If you have a SMS package, the number of SMS messages will be deducted from the package first, and then charged according to the normal SMS fee. If you really want to send a text message by fetion for free, you have to fly around on your mobile phone and send a message back if something happens. Of course, you have to add the other party, and the other party agrees to add you as a friend before you can send a message.