100 Glossary of TermsPINPersonal 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 to control the FixedDial Store and Call Charge metering. Supplied by yourService Provider. If the PIN2 is entered incorrectly3 times, 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 is entered incorrectly 10 times, the PUK/PUK2 willbe blocked.Registration The act of locking on to a GSM/GPRS network. This isusually performed automatically by your phone.Roaming The ability to use your phone on networks other than yourHome network.ServiceProviderThe organisation responsible for providing access to theGSM/GPRS network.SIMSubscriber Identity Module. A small smart-card whichstores unique subscriber and user-entered informationsuch as Contacts and Short Messages. Supplied by yourService Provider.SMSShort Message Service. A basic mail system used forcellular phones. This service allows sending/receivingof short text messages.WAPWireless Application Protocol. The communicationstandard which enables you to download resources fromthe Internet to your phone.