Glossary of TermsDTMF TonesDual Tone Multi-Frequency tones allow you tocommunicate with computerized phone systems, voicemailboxes etc.GSM Global System for Mobile Communications. The name givento the advanced digital technology that your phone uses.Home Country The country where your home network operates.Home Network The GSM network on which your subscription details areheld.NetworkOperator The organization responsible for operating a GSM network.Password Used for the control of the Call Bar. Supplied by yourService Provider.PINPersonal Identification Number used for SIM security.Supplied by your Service Provider. If the PIN is enteredincorrectly 3 times, the PIN will be blocked.PIN2Personal Identification Number used for the control ofFixed Dial Store and Call Charge metering. Supplied byyour Service Provider. If the PIN2 is entered incorrectly 3times, the PIN2 will be blocked.PUK/PUK2PIN/PIN2 Unblocking Key. Used to unblock the PIN/PIN2.Supplied by your Service Provider. If the PUK/PUK2 isentered incorrectly 10 times, the PUK/PUK2 will beblocked.Registration The act of locking on to a GSM network. This is usuallyperformed automatically by your phone.Roaming The ability to use your phone on networks other than yourHome network.Service Provider The organization responsible for providing access to theGSM network.SIMSubscriber Identity Module. A small smart-card whichstores unique subscriber and user-entered informationsuch as Phonebook and Short Messages. Supplied by yourService Provider.57Glossary of Terms