IPhone apps to block certain phone numbers?

My cell has been ringing off the hook from three specific numbers. I'm not sure if they're telemarketers or what, but it's driving me insane. Today alone I've had 14 calls. Is there an app I can download that can at least stop them from making my phone ring or just, block them?

IBlacklist:

A third-party filtering app like mobile nanny may help you block specific phone numbers. Check it out: http://www.mobile-parental-control.com/

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