The required V-network only charges a monthly fee in this city, but calls in other places are charged according to normal calls.

For example, if you are a V-network in Neijiang, you two can only use it in Neijiang, and no matter which one of you calls out of Neijiang, you have to pay a fee. Do you understand? You can ask if you don't understand. The charge is: you only charge three yuan a month, and there are also two yuan.