SMS of short message protocol

SMS(Short Messaging Service) is short message service. It is the earliest short message service and the most popular short message service at present. Through it, mobile phones can send and receive short messages to each other, and the content is mainly text, numbers or binary non-text data. At present, the length of this short message is limited to 14 bytes. SMS has been welcomed by many users with its simple and convenient use function, and it is rapidly popularized. However, it is always the first generation wireless data service, and there are technical standards limitations in content and application.