how do I block scammers from calling my phone?

It seems like its every day I get at the least three or four calls from telemarketers and scammers trying to sell or trick me into their scheme.  I am on a "Do not call list" but it does not work.  Its a lousy system.  I signed up for this list a few years ago but they continue to find a way around it.  I know Im not the only concerned person with a phone with this aggravating issue.  So, my question, as mentioned in the title, is there a feature on my iphone6 that I can activate to prevent these calls from getting through

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