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App to block phone numbers ?

I'd wonder how much time it adds before you hear the first ring of the phone (which some folks already complain about). This app has to be 'in front of' the dialer app to do it's job. It has to take SOME time to look at the incoming phone number and compare it to the list(s) of calls to block/allow. It would be good to know if that time is measured in milliseconds, or seconds?
 
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