What do you mean by "short message within the network" and "short message between networks"?

Short messages in a network are sent to the same network, such as mobile to mobile.

Internet SMS is sent to another network, such as China Unicom.

Text message:

Short Message Service (SMS for short) refers to the text or digital information directly sent or received by users through mobile phones or other telecommunication terminals. The number of characters that users can send and receive SMS at a time is 160 English or numeric characters or 70 Chinese characters.

In 20 14, China Mobile announced that it would create a new service entrance for users in the era of mobile internet through "unified communication". This move is interpreted by the industry as: giving up SMS and embracing unified communication.