What is the most economical way to make a phone call between Urumqi and other places?

I am a freshman. It is free for my classmate to call his boyfriend. If the person you know is a college student in Urumqi (probably), you can ask him to help you with two phone cards, plus the service fee of their school V network (M-Zone business), which is 3 yuan. Most people in Urumqi University know it, and then you take one of the cards. This needs roaming, roaming fee is free, your home seems to be more than 40 yuan a month. Supplement: V network provides preferential activities for college students. Teachers and students at school can go to the business hall with relevant certificates (student ID cards). Monthly operating expenses 3 yuan. The two sides make free calls in Urumqi. Now I also offer this. My boyfriend called me in Urumqi, and we were all free.