The principle of texting?

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Edit it on a terminal device, such as a mobile phone, when sending a short message, and then store it in binary. When you send it, you modulate it into a rated signal, load it on the carrier, and then forward it to the tower [also called base station] to receive the signal. Then he sends it to the local ISP computer room through the line, such as moving the computer room of a local branch. The server in the computer room buffers for the first time, and then he inquires about the data content you sent. If the number is covered by the same tower, if not, it will be forwarded to the designated tower (including other provinces). When someone else's mobile phone receives the signal and decodes it, he will also send a confirmation signal to the transmission tower. The signal will eventually be transmitted back to the forwarding tower, and the forwarding tower will forward the signal to you to confirm the success. If no signal comes back after a certain period of time, it is confirmed that the transmission has failed.

This is the principle, but in fact, the processing and operation of the computer room is far from so simple, and it must be regrouped, numbered, decoded, routed and so on. However, these things are only instantaneous, and they are not completed in a second.