RoboKiller does a great job EXCEPT when it occasionally grabs a call that's important and should have been allowed... Then it can create havoc. My car dealership is on my contacts but the mechanic used a line that's 1 number off from the number I had saved to my contact & he was mortified by what Robokiller subjected him too. He almost called 911 because he was fearing for my safety. THAT IS TAKING THINGS A LITTLE TOO FAR!!! So robokiller looses 1 star fo not being able to discern the difference