What is the principle of information exchange between Internet and mobile phone?

There is no profound principle, because mobile phones also use digital networks, which have the same address mapping as our computers, but there is no channel between our internet network and mobile phone network. The reason why we can send short messages to each other is because we use software to connect the two networks. Of course, the communication network must be opened in advance. With the bridge of communication software, of course, you can communicate information!