Unicom is "dead" and looks very cheap, but the cost of making a phone call is not clear, and sometimes there are many inexplicable expenses.
Not to mention PHS, not at all!
If you don't make a long distance call, the mobile fee is not expensive. If you make a long-distance call, you can get the information. There are many colleges and universities nearby, and they are also very cheap, ranging from one to two cents a minute.