Samsung SGH-x427 User Manual page 186

Glossary
Dual Band
Ability to operate with both DCS (1900 MHz) and GSM (850
MHz) networks. The phone automatically uses the network
with strongest signal and even switches networks during a
call within the same operator's network.
EMS (Enhanced Message Service)
An adaptation of the Short Message Service (SMS) that
allows you to send and receive ring tones and service
provider's logo, as well as combinations of simple media to
and from EMS-compliant handsets. Because EMS is based
on SMS, it can use SMS centres the same way that SMS
does. EMS works on all Global System for Mobile
communications (GSM) networks. EMS senders can use
text, melodies, pictures, sounds, and animations to
enhance the expressive power of messages that are limited
by the display constraints of mobile devices.
GSM (Global System for Mobile Communication)
International standard for cellular communication,
guaranteeing compatibility between the various network
operators. GSM covers most European countries and many
other parts of the world.
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