– 3–19 –3.12. Glossary of TermsTerm DefinitionDTMF Dual Tone Multiple Frequency tones. The numeric keys 0 to 9, and * and # willgenerate different DTMF tones when pressed during conversation. These areused to access voice mail, paging and Home banking services.GSM Global System for Mobile communications. The name given to the advanceddigital technology that the telephone uses.Home network The GSM network on which subscription details are held.Hot Key Dial Hot Key Dial allows quick access to numbers stored in the Phonebook of ServiceDial Number list. The source of the Hot Key Dial may be defined by the user orpreprogrammed by the Service Provide. It is most likely to be preprogrammed tothe Service Dial Numbers by the Service Provider.Phone Lock code Used for security of the telephone.Message Centre Where messages are sent before they are forwarded on to their destination. TheMessage Centre telephone number may be programmed into the SIM orsupplied by the service provider.Network operator The organization responsible for operating a GSM network.Password Used for the control of the call bar function. Supplied by the service provider.PIN Personal Identification Number used for SIM security. Supplied by the serviceprovider.PIN2 Personal Identification Number used for the control of Fixed Dial Memory andcall charge metering.Supplied by the service provider.PUK/ PUK2 PIN/PIN2 Unblocking Key. Used to unblock the PIN/PIN2. Supplied by theservice provider.Registration The act of locking on to a GSM network. This is usually performed automaticallyby the telephone.Roaming The ability to use the telephone on networks other than the Home network.Service Dial Numbers Service Dial Numbers are predefined numbers that allow the user to access aset of special services provided by the Service Provider. For example billinginformation or access to Voice Mail.Service provider The organization responsible for providing access to the GSM network.SIM Subscriber Identification Module. A small smart-card which stores uniquesubscriber and user-entered information such as Phone Book, Fixed DialMemory and short messages. Supplied by the service provider.SupplementaryServiceNetwork-controlled GSM functions supported by the telephone. Supplementaryservices may only be available on a subscription bases.Wild numbers Spaces in a stored telephone number. When the telephone number is recalledpressing a numeric key will fill in a space. This can be used to restrict dialing to aspecific area.