Totally agree, the options that iOS gives you to attempt to control spam are basically either pathetic or non-existent. I get tons of spam calls from one country, presumably doing a "missed call" scam trying to get me to call back and pay crazy rates. I don't see any reason why implementing a "block everything from country code x" feature would not be completely trivial, and it would instantly solve the problem. Yet my stupid smartphone can't do it.