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Contents: MMS vs SMS. Definitions. SMS is the abbreviation for Short Message Service and is the text communication service component of a phone or mobile communication system, using standardized communications protocols that allow the exchange of short text messages between fixed line or mobile phone devices.
SMS Messages. 1  SMS stands for Short Message Service. This is what is commonly known as a text message. 2  A SMS message is 160 characters. 3  If you want to stop SMS messages or offers, type STOP and send to sender.