How are short messages sent to each other?

Short message is a kind of non-real-time data service, and the whole sending process adopts store-and-forward mechanism. The short messages you send will be temporarily stored in the server, and then sent to the target mobile phone by the server, just like we can chat with each other on QQ.

GSM is the second generation wireless communication system of European standard, commonly known as GSM. It uses digital technology to divide time into time periods, so that different users can enjoy one frequency.

CDMA is the second generation wireless communication technology of American standard, which translates into code division multiple access. It uses random codes that do not interfere with each other to realize that different users * * * enjoy a frequency.