GlossaryPacket-SwitchedA type of network in which relatively small unitsof data called packets are routed through anetwork based on the destination addresscontained within each packet. Today’s Internet isfundamentally a quintessential packet-switchednetwork. Whereas voice requires a smooth flowof traffic to avoid echo and breakup, data can becut into small packets with each being sentacross the network and reassembled at the finaldestination. Packet inevitably allows a greateramount of users because it does not require adedicated open circuit. PDC-P in Japan, GPRS inEurope and all the future 3G networks will bepacket-switch.PIN (Personal Identification Number)Security code that protects the phone/SIMsuccession. The eight-digit number is supplied bythe service provider with the SIM card.RoamingUse of your phone when you are outside yourhome area, when travelling for example.SIM (Subscriber Identification Module)Card containing a chip with all the informationrequired to operate the phone (network andmemory information, as well as the subscriber’spersonal data). The SIM card fits into a small sloton the back of the phone and is protected by thebattery.SMS (Short Message Service)Network service sending and receiving messagesZ107Eng_Vodafone.book Page 129 Friday, October 22, 2004 5:40 PM
