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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.
Text messaging. Text messaging (SMS) is a two-way mobile messaging service that allows you to send and receive short text and email messages on text-capable mobile devices. You can use text messaging with both T-Mobile and non-T-Mobile customers.