Joke Collection Website - Blessing messages - What is the principle of mobile phone receiving short messages?

What is the principle of mobile phone receiving short messages?

Cell phone-base station-cell phone.

Usually, it shows that the SMS has been sent. It is the mobile phone that sends the short message, and it is not known whether the base station sent it successfully.

The report sent by SMS is the prompt given by the mobile phone to the user after the base station replies that the mobile phone has been sent successfully.