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iPhones do this but IIRC it works through coordination with the carrier, so not everyone sees it.

Which carriers work? I'm on AT&T. Same SIM card I used with the Pixel. I'd be happy to meet Apple halfway on this one, I just want the spam gone.

I have AT&T and see “suspected spam” calls on my iPhone.

I had it on T-Mobile, switched to Verizon, still have it.