How to send short messages to mobile phones with fixed lines?

Fixed-line phones can also send messages to each other using PHS, but your mobile phone must have this function. Apply to the telecom company for a "home e" phone. I don't know where you are if it's not expensive. I am in Hainan, as long as 100 yuan. If you go, you won't understand, and the salesperson will teach you how to use it.