This is the commercial behavior of China Mobile and China Unicom, and the school will not take care of it. The answer upstairs is wrong. The school notice will not be sent to everyone by SMS. I am a junior and have never heard of it. . . As for which one to choose, you can choose it yourself. The situation at school is like this. Class 07 and Class 08 are basically mobile cards. By the level of 09, Unicom Mobile is almost the same, accounting for most of it, and some of it is telecom. You are a junior in grade 10. If you can't choose a good card, you can choose one after school and see which one your classmates use more. I hope my answer can help you.