Have you ever noticed the 30 calls you receive a day aren't the same number? Spammers use a number once and then switch to another number. That's how they sidestep Nomorobo.
Nomorobo is only good if subscribers report the nuisance number and by the time they report it, the spammers have moved on to another number. There are 10 billion numbers to choose from...they'll never run out of spoofs.
Since Nomorobo launched in Oct 13, my onetime calls have skyrocketed 43 percent...especially onetime calls from my exchange. Nomorobo ain't all that.