China Mobile sent me a short message with the following contents: "Warm reminder: Dear GSM customers, the 8G LTE single-mode traffic you handled is given away.

This seems to be a package for new users in some areas. Generally, it is the traffic generated by surfing the Internet under the provincial 4G signal (4G signal is not covered by 100% at present), and other 3G status is not included in this traffic package. My personal feeling is that the mobile company lets you experience the speed of 4G, and gives you 8G traffic to make you develop the habit of "profligacy", but once the traffic is used up, the later cost is quite expensive. I don't know if this is what I mean.