I want to unsubscribe from CRBT. What is the business serial number?

China Mobile customers can edit SMS 0000 and send it to 10086 for service inquiry and unsubscribe, so as to quickly inquire about all kinds of monthly value-added services subscribed by the mobile phone account up to now. Customers can send instructions to reply to SMS according to the prompt, so as to easily choose the corresponding service serial number to unsubscribe from one or more subscribed monthly value-added services (except those that cannot be unsubscribed due to signing the agreement). You need to use the business serial number to unsubscribe from the business, as shown in the red box. Please understand.