Settings103Scroll to an authority certificate, and select Options >Trust settings. Depending on the certificate, a list of theapplications that can use the selected certificate is shown.Symbian installation: Yes—The certificate is able tocertify the origin of a new Symbian operating systemapplication.Internet: Yes—The certificate is able to certify servers.App. installation: Yes—The certificate is able to certify theorigin of a new Java TM application.Select Options > Edit trust setting to change the value.Security moduleTo view or edit a security module (if available) in Securitymodule, scroll to it, and press . To view detailedinformation about a security module, scroll to it, and selectOptions > Security details.Factory settingsTo reset some of the settings to their original values, selectTools > Settings > General > Factory settings. To do this,you need the lock code. See ‘Phone and SIM card’, p. 100.After resetting, the device may take a longer time to poweron. Documents and files are unaffected.PositioningSelect the used Positioning methods to detect thelocation of your device: Bluetooth GPS to use acompatible external GPS receiver with Bluetoothconnectivity, and Network based to use information fromthe cellular network (network service). The locationinformation can be used by compatible applications inyour device.PhoneTo edit the settings related to making and receiving calls,press , and select Tools > Settings > Phone > Call,Call divert, Call barring, or Network.CallSend my caller ID—You can set your phone number to bedisplayed to (Yes) or hidden from (No) the person to whomyou are calling, or the value may be set by your serviceprovider when you make a subscription (Set by network)(network service).Call waiting—If you have activated call waiting (networkservice), the network notifies you of a new incoming callwhile you have a call in progress. Set the function on(Activate) or off (Cancel), or check whether the functionis activated (Check status).