Thankfully that part has vastly improved with STIR/SHAKEN, combined with number reputation management.

The problem with that, at least on my experience with iPhone, is you can only get the authentication signal after you’ve already hung up. The only thing I see is a small checkmark next to the “location” of the call in my recent call log. I can’t find any indication of a stir/shaken status in the active call screen.

So asking people to take the step to confirm the call is legitimate won’t work- they can’t tell until they’ve already terminated the call. It’s useless for purpose imo.

On my Pixel some calls just get auto-rejected. Others will get through but be marked with a red caution symbol for the picture and say "Scam Likely". Then finally sometimes the call will come through with just the number but still have that red caution symbol.

I imagine it is doing something with STIR/SHAKEN along with how many other times similar calls have been flagged as spam calls.

My carrier has a similar “scam likely” feature but afaik that is not directly tied to stir/shaken. I’ve also signed up to have calls rejected and can see them in the carrier app.

I have reported at least a thousand different scam calls over the past two years and so my blocked number list is so large it freezes the phone for a minute or so while it loads. Still the scammers persist…

I remember when I used Ting, I could specify what would appear as caller id. If I had wanted to abuse this, I could easily have had it display whatever number I wanted instead of my name. Since a number of phones would display the caller id instead of the number when caller id was available, nobody would know that the number was not real. I am not sure if this has changed at all.