G e n e r a l i n f o r m a t i o n10The module PIN is required to access the information in the securitymodule. See “Security module,” p. 93.The signing PIN is required for the digital signature. See “Digitalsignature,” p. 94.PUK codesThe personal unblocking key (PUK) code and the universal personalunblocking key (UPUK) code (8 digits) is required to change a blockedPIN code and UPIN code, respectively. The PUK2 code (8 digits) isrequired to change a blocked PIN2 code. If the codes are not suppliedwith the SIM card, contact your local service provider for the codes.Barring passwordThe barring password (4 digits) is required when using the Call barringservice. See “Security,” p. 64.■ Configuration settings serviceTo use some of the network services, such as mobile Internet services,MMS, Push to talk, Nokia Xpress audio messaging, or remote Internetserver synchronization, your phone needs the correct configurationsettings. You may be able to receive the settings directly as aconfiguration message. After receiving the settings you need to savethem on your phone. The service provider may provide a PIN that isneeded to save the settings. For more information on availability,contact your network operator, service provider, nearest authorizedNokia dealer, or visit the support area on the Nokia Web site,.When you have received a configuration message, Configuration sett.received is displayed.To save the settings, select Show > Save. If the phone displays Entersettings' PIN:, enter the PIN code for the settings, and select OK. Toreceive the PIN code, contact the service provider that supplies thesettings. If no settings are saved yet, the received settings are saved and