How to block or unmask an unknown number calling my iphone?

I've been getting 2-3 calls a day to my iphone from an unknown number. That alone is annoying enough, but on top of that it's a fax machine that's leaving me annoying noises as voicemails. After about the 20th time, I was fed up with it. Is there anything I can do? I'd like to either block unknown numbers entirely on my iphone (can they leave voice messages then though?), or be able to see the number so I can tell them to stop calling me!

AT&T said since the number is unknown they can't add it to my blocked list, anyone know what I can do without paying money? Some kind of app that unmasks unknown numbers OR blocks them?

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