189Glossary188EMS (Enhanced Message Service)An adaptation of the Short Message Service(SMS) that allows users to send and receive ringtones and the service provider’s logo, as well ascombinations of simple media to and from EMS-compliant handsets. Because EMS is based onSMS, it can use SMS centres the same way thatSMS does. EMS works on all Global System forMobile communications (GSM) networks. EMSsenders can use text, melodies, pictures,sounds, and animations to enhance theexpressive power of messages that are limitedby the display constraints of mobile devices.GPRS (General Packet Radio Service)New non-voice value-added service that allowsinformation to be sent and received across amobile telephone network. GPRS providescontinuous connection to the Internet for mobilephone and computer users. It is based on theGlobal System for Mobile Communication (GSM)circuit-switched cellular phone connections andthe Short Message Service (SMS).GSM (Global System for MobileCommunication)International standard for cellularcommunication, guaranteeing compatibilitybetween the various network operators. GSMcovers most European countries and many otherparts of the world.GlossaryTo help you understand the main technical termsand abbreviations used in this booklet and totake full advantage of the features of yourmobile phone, here are a few definitions:Active FolderAbility to answer a call simply by opening thephone.Call BarringAbility to restrict outgoing and incoming calls.Call DivertingAbility to reroute calls to another number.Call HoldingAbility to put one call on standby whileanswering or making another call; you can thenswitch between the two calls, as required.Call WaitingInforms you that you have an incoming callwhen you are engaged on another call.Caller Line Identification Services(Caller ID)Services allowing subscribers to view or blockthe telephone numbers of callers.