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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.
Answer Wiki. An SMS short code is a 5-6 digit phone number that is used by businesses to opt-in consumers to their SMS programs, and then used to send text message coupons, offers, promotions, etc. to those customers that had previously opted-in.