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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 (Short Message Service) and MMS (Multimedia Messaging Service) are both used in mobile phones for non-voice communications. Some landline phones also have SMS capability. While both SMS and MMS stand for the service, the abbreviations are often used in common parlance to mean the actual message itself that is sent using the service.