NoMoRobo is obsolete. It's only good if someone has already reported the number.
For example, a scammer spoofs a number while simultaneously dialing thousands of people. In the perfect situation, someone would immediately report it to NoMoRobo. If the scammer uses the number again, NoMoRobo would hopefully block the calls. In this situation, only the first batch of subscribers would be affected.
How would scammers bypass NoMoRobo? Spoof a different number for each batch of calls. By the time someone reports it, the scammer has already stopped using it. There are 10 billion numbers...choose another one. Unfortunately, if the newly-blocked, spoofed number is assigned to a legitimate subscriber (Cox)...well, that subscriber now has the burden get his/her number released.
In the past 30 days, I’ve received 15 calls from one-time numbers. No history on NoMoRobo, 800notes, Mr. Number or even Google. To me, they're obviously spoofed numbers. They’ve already hit-and-run. NoMoRobo would just being blocking ghosts.
Selective Call Rejection is useless. It will, again, increase your bill and is limited to a few numbers. I understand I’d enter asterisks and codes from my telephone to add numbers to my list. How archaic is that? Am I to enter codes every day? What if my list is maxed? Which number do I remove? Which number would be the least nuisance to remove? Again, am I to determine the least-nuisance number(s) every day?
What about fake numbers with fake area codes and exchanges? Am I paying to block numbers that don’t even exist, such as (000) 000-0000, (123) 456-7890...my number? That's not fair.
I’m blocking everybody except family, friends, coworkers and business contacts. If I know of a legitimate number, I’ll add it. If I missed a legitimate call, I’ll add it and call them back. Auto-blocking is a lot easier than selectively blocking.