146GlossaryTo help you understand the main technical termsand abbreviations used in this booklet and take fulladvantage of the features on your mobile 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 while answering ormaking another call; you can then switch betweenthe two calls, as required.Call WaitingAbility to inform users that they have an incomingcall when engaged on another call.Caller Line Identification Services (Caller ID)Services allowing subscribers to view or block thetelephone numbers of callers.Glossary147Enhanced Message Service (EMS)An adaptation of the Short Message Service (SMS)that allows users to send and receive ring tones andoperator logos, as well as combinations of simplemedia to and from EMS-compliant handsets.Because EMS is based on SMS, it can use SMScentres the same way that SMS does. EMS workson all Global System for Mobile communications(GSM) networks. EMS senders can use text,melodies, pictures, sounds, and animations toenhance the expressive power of messages that arelimited by 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 a mobiletelephone network. GPRS guaranties continuousconnection to the Internet for mobile phone andcomputer users. It is based on the Global Systemfor Mobile Communication (GSM) circuit-switchedcellular phone connections and the Short MessageService (SMS).GSM (Global System for MobileCommunication)International standard for cellular communication,guaranteeing compatibility between the variousnetwork operators. GSM covers most Europeancountries and many other parts of the world.