182GlossaryTo help you understand the main technical termsand abbreviations used in this booklet and take fulladvantage of the features of your mobile phone,here are a few definitions.ALS (Alternate Line Service)Capability of associating two lines with one SIMcard. With this service, you can make and receivecalls on either line, as required.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.CLI (Caller Line Identification) ServicesServices allowing subscribers to view or block thetelephone numbers of callers.Glossary183EMS (Enhanced Message Service)Network service sending and receiving messagesthat include images, sounds and animations to andfrom another user without having to speak to thecorrespondent.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.IrDA (Infrared Data Association)A standard defined by the IrDA consortium. Itspecifies a way to wirelessly transfer data viainfrared radiation. The IrDA specifications includestandards for both the physical devices and theprotocols they use to communicate with each other.