Im looking into that stuff too...
I wanna know if your using the white black list... when they call and the call is blocked... do you get a message saying missed called and it still shows their number? Because the BerryBlocker does that and I hate that... The reason I want to get a blocker is so I DONT know they called... Not notify me after that they called... and then I have to keep deleting them from my call log.
Another question is when its blocked does it go to the voice mail? Or it just doesnt ring at all on their side? Because I dont want 20 voicemails and I never even saw who called me....