You'll need to route the calls to an 800 number to display a blocked caller ID. One can't block their caller ID's from 800 numbers.
You could try www.kall8.com -- It's a premium service, so you will have to pay a fee. But it seems pretty nominal. So depends on if you're willing to pay to find out who's calling
Its called "TRAPCALL" and is available in the market... or "google play store" as they now call it. TRAPCALL does cost $ but has very good reviews from the people who actually paid for it. (Monthly fee). I downloaded it but you cannot even test it unless u pay for the service. Maybe ill try it in a few weeks. Hope this helps. - Also, a very interesting feature is it also sends u a text with caller name and STREET ADDRESS. Wonder if it works?
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