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Unfortunately, S9 removed the blocking options like what it was in older revisions. I can't see blocking list with option "Starting with" to block area codes of spammers
I raised this as feedback and reply was they will transfer the request to software department to decide for future updates. 
But funny issue is this feature was available even in note 5, S4 etc and currently Apple is supporting it. So why it's removed is a big question. 
Samsung pushing us to use 3rd party software like Call blacklist which I paid for it but it's buggy and developer doesn't bother himself to even answer the emails. 
Making long story short I'm disappointed to switch from Apple to Samsung and loose my normal business phone features.