I'm from TV University, and I'll tell you the experience: it's very useful! This is a real problem! Our classmates bought it in a store called "Longyan Communication Bookstore in Fujian Province" on Taobao.

Enter Taobao, search the shops in that column, and then enter "Longyan Communications Bookstore, Fujian Province" to consult Wangwang of the shops. We will only go there to buy it, because the question is accurate! Will not be cheated! It's that simple!