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What does the briefing mean?

SMS means "short message service".

ShortmessageService (English: ShortMessageService, abbreviated as SMS;; Sometimes it is also called information, short message and TEXTMESSAGES. This service also has many English common names such as SMSes, TEXT messages, MESSAGES and even TEXT, txts. It is a kind of mobile phone service.

Short message service first appeared in GSM mobile phones, and now it can be used in almost any mobile phone system, such as 4G mobile phones.

Short message technology was first applied to European GSM system in 199 1. The GSM protocol 03.40 defines the point-to-point mode, which is the most commonly used mode for users.