- It really is completely free. They never even asked for a credit card.
- It's a blacklist-based system - it looks up the number calling you, and if it's in their (apparently huge) database, it gets blocked. If the caller is not on the blacklist (and presumably your friends, family, and local people are not), they get through without any trouble.
- You don't have to do anything to maintain it. With the Sentry 2, I spent some time every week adding numbers to block and numbers to allow. With Nomorobo, I do nothing. I like nothing :)
We've had just one robocall slip through since starting our use of Nomorobo. That was a political call for Bernie Sanders (boy did they pick the wrong household for that!). Our neighbors reported getting dozens of robocalls in the days leading up to our primaries this Tuesday. Nomorobo blocked all but one of them.
At the same time, now we have zero problems with people getting through that we want to get through. The Sentry 2 greets callers it doesn't know with a deliberately intimidating message, so if a store calls us and we don't have their number programmed in, they get that message. Now they just hear the phone ring, as though we had no call blocking at all.