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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.
Unlike many services in use today, such as MMS and other data driven services, SMS still works on the fundamental voice network, and is based on the big three GSM, CDMA and TDMA network technologies, making it a universal service. SMS allows for text messages of 160 characters (letters, numbers and symbols) in length.