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I've been using a free alternative to Nomorobo called Hiya that's been working really well, for what it's worth.

I think Hiya uploads your contact list to the cloud - I'd rather pay the $2/month rather than rely on an unknown business strategy.

Agreed, but how do you know for certain they don't surreptitiously upload your contacts after you have granted permission?

Sounds like you are on iOS?