What's a FREE iPhone 4S app that blocks calls and texts?

I have "Blacklist" but my phone still rings and says "Incoming call from BLOCKED" and it allows the random caller to leave a voicemail. I looked at the phone book entry in my phone and added that number to the Verizon.com block list but that only works for 6 months.

There really are no apps, the best way to do it is to go through Verizon, If its not working then you should call them up and ask them why it has stopped working, or add it on again if it was removed. Sometimes those people can change their numbers and still get through, so it may not particularly be a fault in the blocking service.

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