Why does Unicom's 4g card have no data connection, but he sends a text message saying that there is traffic?

Smartphones generally have automatic software update function, which may generate traffic when updating; In addition, when online programs run in the background (if minimized), traffic will still be generated. It is recommended that you close the online program completely when you are not using it. If your mobile phone is not a smart phone, it will not automatically update the software and generally will not automatically generate traffic. You can log on to the home page of the online business hall and click the phone bill query > bill query > detailed list query > internet traffic, and you can query the details of mobile internet access within half a year. If you have any questions, you can also contact the Unicom customer service that the number belongs to for verification.