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I have unsuccessfully tried to activate NoMoRoBo and need support. These are the steps performed:
How do I save the setting?
On a related issue, I have seen comments on the NoMORoBo interactions, and its failure to block spam. There are the issues:
*60 . you have to pay for Selective Call Rejection before you can use it. Since it can only store 31 numbers, it is hardly worth the effort.
Selective Call Rejection is actually limited to 25 telephone numbers for Cox Voice. I don't believe there's a fee for using it though, but that may depend on the Cox plan you're on. There is an additional fee for Anonymous Call Rejection.