What is the most affordable mobile phone card for Yantai college students?

M-Zone ~ You can buy a card with a call charge of 100 with the cheapest 60 yuan in Yantai University Teachers College ~ Then make a long-distance call and send a short message at 20 cents. The monthly fee is 10 yuan to 150 yuan to 20 yuan to 360 yuan. 600 articles in 30 yuan ~ 50 yuan 1000 articles ~ Students send more text messages, so. . . . . By the way, as long as you don't leave the five districts of Yantai (including the counties and cities below), answering the phone is free ~