Just because a call is a spam call doesn't mean it is spoofed. STIR/SHAKEN ends spoofing but anyone can ultimately buy a phone and make calls that are spammy.
Mine literally come from the verified coinbase phone number and say coinbase and everything. If I didn't know for sure they are not calling me I'd think it was real 100%.
I'm very interested in knowing the actual current state of affairs WRT spoofing and a lot of people make claims without evidence which makes it hard to find out. I thank you for providing your evidence here because it does sound like some carriers are still not enforcing. Which is obviously a problem.
Sure, but with phone numbers that can't be spoofed, telcos can terminate service, and filtering technologies can block calls. Spam gets expensive if you have to buy new service every five calls.
Preventing spoofing doesn't have to make spam cost-prohibitive for every spammer to greatly reduce the volume, and it does not interfere with ordinary people obtaining phone service anonymously.
From what I’ve investigated as a recipient of spam calls, I’ve been called from legitimate mobile numbers from my own mobile telco. The only thing that explains that are SIM card banks.
Unfortunately there isn’t an easy way to report abuse to the telcos (and regulators).
Almost every spam call has that I get, is spoofed.
Someone here explained it, once.
I think the spoofed calls use a legacy transport tech that can’t be forced to validate.