What information can China Mobile send to get free traffic?

Mobile, there is no activity of directly sending short messages to receive corresponding traffic for free, or related short messages are used. However, after the handheld app in the mobile phone business hall logs in, at present, all the mobile phone business halls in the provinces have related activities to sign in and receive traffic, or pay attention to the corresponding official WeChat account, and there may be irregular corresponding activities to give a certain amount of traffic.