If you have received a PIN2 code from your service provider, you can use a list of Fixed Dialing Numbers (FDN) to restrict outgoing and incoming calls.
To enable or disable fixed dialing
From the Home screen, tap the applications bar, then tap Settings.
Tap Call settings > "Fixed Dialing Numbers".
Tap Enable FDN or Disable FDN.
Enter your PIN2 and tap OK.
To access the list of accepted call recipients
From the Home screen, tap the applications bar, then tap Settings.
Tap Call settings > "Fixed Dialing Numbers" > FDN list.