I do not want any calls coming to my phone that do not show a number. It doesn't help much to be able to block numbers when those same numbers can turn around and make themselves "restricted" or "blocked" or "private" and then still be able to get through to our phones. Is there a solution for this that I'm unaware of?
Try this 3rd pty App for Android and Iphone device for blocking unwanted calls/unknown calls)
iTm Calls Blacklist- Http://itunes.apple.com/us/app/itm-calls-blacklist-unwanted/id503192755?mt=8
Hope this helps