Thank you for getting in touch with us.
To answer you first question, yes you can just add * after the country code to block all calls from that country eg: +44* will block all incoming and out going calls from the UK provided if the number calling you starts with +44
If you are on roaming and you do not wish to receive any calls from a number you can add it to your yes list or no list and this will block the call while you are on roaming, this means when your mobile device shows 'R' (which generally happens when you are on roaming outside your home network) this list will kick in and block the selected calls.
Hope this is clears your doubt if not please get back to us.
Mcafee Mobile support
That's perfect, thanks a lot!