If that were the root cause, it would have already been fixed. There is no FCC regulation that Congress can't change.

Nope, turns out there is virtually no downside to making spam calls in the US, and so companies continue to do it. The spoofed numbers are just a way they implement that to get around consumer efforts to prevent it.

I'll take your word for that. But the problem is that bad regulation has created a downside for providers to block spam calls so they continue not to.

I would easily switch providers tomorrow if one of the features was "no spoofed numbers". This would be a giant market advantage if not prevented by this regulatory issue (whatever it is).

T-Mobile offers it for free: https://www.t-mobile.com/resources/call-protection

Verizon Wireless offers it for $2.99 a line: https://www.verizonwireless.com/support/call-filter-faqs/

Not sure about the other major carriers.

I am on T-Mobile. There was a point when most of the spam to my phone was from Scam Likely. Then the robocallers learned that this is the truth, and I get spam about my credit card and something in Chinese that isn't so flagged.

I haven't gotten a single spam call since enabling the blocking.

Neither of those block spoofed numbers, both work by creating a blacklist.