30 Copyright © 2005 Nokia• Automatic keyguard > On—When Set delay appears, set the time.You can set the time from 10 seconds to 60 minutes. To deactivate theautomatic keyguard, select Off.• Keyguard code—Enter the security code, and select OK. After you haveselected On, the phone asks for the security code every time you selectUnlock. To deactivate the security keyguard, select Off.Network selection—Select Automatic to have the phone automatically selecta cellular network available in your area. Select Manual to select the networkmanually. The network you select must have a roaming agreement with yourhome network.Start-up tone—Switch on or off the tone that sounds when the phone isswitched on.Welcome note—Enter a message that will be shown briefly on the displaywhen the phone is switched on.Confirm SIM service actions—Set the phone to show or hide confirmationmessages when you use the SIM card services. See “SIM services” on page 36.Cost controlNote: The actual invoice for calls and services from your service providermay vary, depending on network features, rounding off for billing, taxes,and so forth.Select Menu > Settings > Cost settings and one of the following:In-call timer—Turn on or off the display of call time while calling.Call summary—Turn on or off the report of approximate call time after calling.Call costs—Show the approximate cost of your last call or all calls in terms ofunits specified within the Show costs in function (network service).Fixed dialling—Restrict your outgoing calls to selected phone numbers, if allowedby your SIM cards.Prepaid credit—When using a prepaid SIM card, you can make calls only whenthere are enough credit units on the SIM card (network service).Note: When no more charging units or currency units are left, callsmay only be possible to the official emergency number programmedinto the device.Enhancement settingsYou can use your phone with many Nokia enhancements. The Enhancementsettings menu appears only after an enhancement has been connected to thephone at least once.Select Menu > Settings > Enhancement settings > Headset, Handsfree,Loopset, or TTY/TDD and one of the following, depending on the enhancement: