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Doesn't work. Spammers still manage to blind call my actual cell phone number even though I've given it to absolutely not a single person, dead or alive.

Your provider/mvno should allow you change that one easily. I just did with mine that some spammers had. Works great except new one is on the school districts notification list with no easy way to opt-out. But that one is easy to block.

Exactly. Robocallers just call every single phone number. There aren't that many.

Yep. Even if I switch numbers they real number is still out in the wild. And even if it’s not in the wild my guess is they are just calling every combination of numbers.

Google voice can be configured to screen calls from anyone not in your contacts. It works pretty well in my experience.