Do online games set in mobile phones charge for sending short messages? How much is each?

There is a charge for sending text messages, and the amount varies, usually 1 yuan or 2 yuan. This is a profit model of Java games on mobile phones, such as RPG online games on mobile phones. People develop them for you, of course, you have to give some money to the development company, but the playability of this small game is not high. I even played this little game before. Hehe, and you can surf the Internet.