M e n u f u n c t i o n sCopyright © 2005 Nokia. All rights reserved. 29• Keyguard code to activate the security keyguardEnter the security code, and select OK. After you have selected On,the phone asks for the security code every time you select Unlock. Todeactivate the security keyguard, select Off.• Network selection—To set the phone to automatically select a cellularnetwork available in your area, or you can select the network manually.• Start-up tone—To switch on or off the tone that sounds when the phoneis powered on• Welcome note—To enter a message that will be shown briefly on thedisplay when the phone is switched on• Confirm SIM service actions. For more information, contact your serviceprovider.Cost settingsNote: The actual invoice for calls and services from your serviceprovider may vary, depending on network features, rounding off forbilling, taxes and so forth.Select Menu > Settings > Cost settings and one of the following options:• Prepaid tracker (Network service)—To view information of prepaid creditWhen using a prepaid SIM card, you can make calls only when there areenough credit units on the SIM card.