Appendix D: Glossary 101APPENDIX D: GLOSSARYAPN Access Point Name. Directs the user to the gateway or the requiredservice.CHAP Challenge Handshake Authentication Protocol. A security feature for theGPRS network.Copy Copies selected text from short text message without removing it fromthe original message.Cut Permanently removes selected text from short text message.DTMF Tones Dual Tone Multi-Frequency tones (touch tones) allow you tocommunicate with computerized phone systems, voice mailboxes etc.GPRSGeneral Packet Radio Service. A GSM data transmission technique thattransmits and receives data in packets rather than setting up acontinuous channel. It makes very efficient use of available radiospectrum and users pay only for the volume of data sent and received.GSM Global System for Mobile Communications. A digital cellular or PCSnetwork used throughout the world.MMS Multimedia Messaging Service. Attach images and music to textmessages.Network Operator The organization responsible for operating a GSM network.Password Used for the control of the Call Bar. Supplied by your wireless serviceprovider.PINPersonal Identification Number used for SIM security. Supplied by yourwireless service provider. If the PIN is entered incorrectly 3 times, thePIN will be blocked.PIN2Personal Identification Number used for the control of Fixed Dial Storeand Call Charge metering. Supplied by your wireless service provider. Ifthe PIN2 is entered incorrectly 3 times, the PIN2 will be blocked.PUK/PUK2PIN/PIN2 Unblocking Key. Used to unblock the PIN/PIN2. Supplied byyour wireless service provider. If the PUK/PUK2 is entered incorrectly 10times, the PUK/PUK2 will be blocked.Registration The act of locking on to a GSM network. This is usually performedautomatically by your phone.Roaming The ability to use your phone on networks other than your homenetwork.SMS Short Message Service. Transmission of short text messages to andfrom mobile phones via the Network Operator’s message center.