How to have SMS receipt function on IPHONE?

"SMS receipt" needs to be opened in business hall, online business hall and SMS business hall.

The short message receipt service is a short message value-added service launched by China Mobile for individual users. After using the mobile phone to send SMS normally, the mobile phone will immediately display the words "Message sent". But this only shows that the short message has reached the short message center normally; Doesn't mean the other party received it. The short message receipt service refers to the service that the user sends a receipt to the user in time after sending a short message (sending port 10658007). Specifically, it refers to the service that the system sends a receipt to the user in time after the user sends the short message, prompting whether the short message is sent successfully.