Is your number listed as Protected on your Nomo account page?
I read the setup instructions and it's kinda vague how to initiate the Protected status. It's step 7. The previous step (6) instructed to test your phone from your Nomo account page...which you successfully did...but to let your phone ring 3 times.
"You will immediately receive a call letting you know if everything is setup correctly. Please pick up the phone after the third ring."
I wonder why it's 3 rings? Did you wait for 3 rings? Then in Step-7, it reads (after waiting 3 rings), "Your number will now be listed as Protected."
Also, on your Nomo account page, is there an option to enable or disable Nomo? That seems like an essential feature if you're waiting for a critical call from an unknown number and you don't want Nomo tinkering with anything.