How can digital fortune-telling on mobile phones be accurate and reliable now?

Hehe, it's not really a fortune-telling. It is a kind of big data statistics, and it is a probabilistic conclusion compiled by many people's information. Statistics are accurate because they are large enough to be generally applicable to most people.

For example, if you enter the height 170 cm, the system software will tell you that if you are a girl, your feet are 37~38 yards, and if you are a boy, your feet are 39 yards to 4 1 yards, because most people are in this range.