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Enhanced Messaging Service was a cross-industry collaboration between Samsung, Ericsson, Motorola, Siemens and Alcatel among others, which provided an application-level extension to Short Message Service for cellular phones available on GSM, TDMA and CDMA networks.
EMS was an intermediate technology, between SMS and MMS, providing some of the features of MMS. EMS was a technology designed to work with existing networks, but was ultimately made obsolete by MMS.
An EMS-enabled mobile phone could send and receive messages that had special text formatting , animations, pictures, icons, sound effects and special ringtones.
EMS messages sent to devices that did not support it would be displayed as SMS messages, though they may be unreadable due to the presence of additional data that cannot be rendered by the device.