To protect against unauthorized calls, you can restrict the type of calls the phone can make or receive, via the Settings>Call barring menu on a Series 60 device and the Settings>Security settings>Call barring service menu on a Series 40 device. For example, you can bar the phone from making expensive international calls when the device is roaming.
When you activate or remove those settings, the phone communicates with the network to update settings with the network operator. You need to have the four-digit SIM PIN code to activate call restriction. Call your operator's phone support and ask for the Extended Services SIM password, if you do not have it. Once you have the SIM card PIN, you can change it from the same menus you use to change the phone's lock code.
An even more extreme measure is to restrict the phone to dial only a predetermined list of phone numbers. You can use the Settings>Security>Phone and SIM>Fix dialing menu on a Series 60 phone or the Settings>Security settings>Fixed dialing menu on a Series 40 phone to do that. You will be asked to select the allowed numbers from your Contacts list, and to enter the SIM password to activate the setting.
When you activate or remove those settings, the phone communicates with the network to update settings with the network operator. You need to have the four-digit SIM PIN code to activate call restriction. Call your operator's phone support and ask for the Extended Services SIM password, if you do not have it. Once you have the SIM card PIN, you can change it from the same menus you use to change the phone's lock code.
An even more extreme measure is to restrict the phone to dial only a predetermined list of phone numbers. You can use the Settings>Security>Phone and SIM>Fix dialing menu on a Series 60 phone or the Settings>Security settings>Fixed dialing menu on a Series 40 phone to do that. You will be asked to select the allowed numbers from your Contacts list, and to enter the SIM password to activate the setting.
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