Mobile is satisfied with the activity, why can't it be answered?

Hello, Beijing Mobile will send invitation messages to some customers from time to time. Only after receiving the invitation information can you participate in the research or answer questions. Please be sure to reply to the message within the activity time mentioned in the message, and make sure that the message description is correct (there is no space in the same case of "My"), and please reply within 30 minutes when answering questions. If you are still unable to attend, it is recommended to contact the local 10086.