Is it possible to block block numbers?

I have a iPhone I just a call about an hour ago. It was from a blocked number they left a voice mail witch was only 3 seconds long. S/he didn't even say anything. I would love to know if I can block this. They are really scary for me.

I have a jailbroken iPhone 4s running iOS 6. Tried many ways, installed kinds of apps, but still can't stop others from sending SMS or voice mail. Very frustrating!

Yes you can download call blocker from market…

Yes, but before blocking that number you must know who is the person you are going to block. If you want to have all the information you need you can give a try on this site http://phonenumberuser.com/.It can help you to detect and report/block the correct person.

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