Roaming calls are 60 cents per minute, and answering calls is 40 cents per minute. (On the mobile side, it's all-inclusive, that is, 6 cents per minute for making a phone call and 4 cents per minute for answering a phone call).
If you are going to other places for a short time, you can start a dynamic roaming package, 1.5 yuan for one month, and the call and answer are 25 cents a minute.
If you are in the field for a long time, it is recommended to buy a local card.