You can block certain types of calls such as incoming calls when you're abroad.
Find "Voice call"
Press the menu icon.
Press More settings.
After a moment the current settings are displayed.
Press Call barring.
Press Voice call.
Select barring option
Press one of the following options:
All outgoing calls
Int'l calls except home
All incoming calls
Incoming calls when roaming
If you select Int'l calls except home, no international calls can be made, but you can still call home when you're abroad. If you select Incoming calls when roaming, you can't receive incoming calls when you take your mobile phone abroad. Incoming calls will be rejected by the network and the call won't go through.
Activate or deactivate call barring
Key in your call barring password and press OK to activate or deactivate the function.
Return to the Home screen
Press the Home key to end the session and return to the Home screen.