China Unicom sent a short message saying that I started ringing service, but I didn't start ringing service, okay? Is this Unicom trying to cheat me?

You can't say that. It's just a promotion. Just like shopping, someone introduces and sells goods to you, so you just don't buy them. As long as you don't drive it yourself, there is no charge.

Some services can be tried for free for a period of time, and must be cancelled before the expiration of the free period, otherwise they will be automatically opened and charged!